第09单元 · 四档阅读与填词

Some summer camps use university rooms. On one campus, arriving begins with a form before a young person receives a key. Anyone under eighteen brings a health form signed by a parent. Without that form, workers cannot admit the young person for the night.

The outside door stays locked. Each young person receives a card for that door and a separate room key. Mixing them up causes a simple problem: the room key does not open the building.

Leaving also has two stages. A young person needs a camp worker's permission to go early. On the last day, workers let the person leave with a parent or with an adult named on the form.

The order keeps one check from doing every job. The form comes first, the card and key control different doors, and the named adult completes the stay. Arriving is a short series of steps, not one desk and one key. Each stage answers a different safety question.

A butterfly in a garden can feel special. It can also become a record that helps science. A person notes the place and date, then adds a clear photograph to eButterfly. This keeps the butterfly visit tied to a time and place.

The picture is especially helpful when two kinds look much the same. The person suggests a species name. Other people can see the same picture and record later, so the name does not depend on what one person remembers.

The first name is not locked in. A specialist may agree or suggest a better match. People who are not experts can also say what they notice. When a clearer picture or a new detail appears, the record can change.

Across many reports, scientists can monitor where butterflies appear and when they are active. Scientists can compare these records over many months. One photograph cannot answer a large question by itself. Its value grows because the place, time, picture, and later checks stay together.

Seven hungry children wait while their mother cooks a pancake. It lies in the pan, thick and brown. When she tries to turn it, the food jumps away and rolls out of the house.

Along the road, a man and several animals ask it to stop. The pancake names everyone it has left behind. Each new speech grows longer. It must contain all the earlier names, and the growing list makes the pancake sound more sure of itself.

At last, a pig asks the pancake to come closer. The pig says it cannot hear from far away. Proud of its long story, the food rolls near enough to repeat the words.

The pig eats it in one bite. The tale begins with heat and rising steam, then sends a kitchen object down a road. The repeated list makes the pancake feel safer each time. In the end, its pride carries it close to the one animal waiting for that mistake.

In January 2022, the UK Highway Code changed its guidance on road position. At some junctions and narrow places, a cyclist is now advised to use the centre of the lane. The aim is visibility and protection from an unsafe pass. Near the edge, a rider may be less easy to see and easier to squeeze past.

The same update explains group riding. Two people may ride alongside each other, especially when an experienced rider accompanies a child or less confident companion. This position can help the stronger rider protect the other person. They should move into single file when it is safe to let traffic pass.

At a roundabout, drivers should give bicycles room and avoid cutting across their path. If the junction feels too difficult, a cyclist can get off and walk the cycle around it. On the sidewalk, the person is moving as a pedestrian, so the route continues under a different set of safety rules.

Before moving sideways, riders still look behind and judge speed. The 2022 change did not turn one lane position into a rule for each road. It recorded a more careful idea: the safest position depends on local traffic, space, and the next move.

Jabez Wilson sees an advertisement for a strangely specific job. A red-haired man may earn four pounds a week by copying an encyclopaedia. Wilson is a respectable gentleman with a small shop and little spare money. His assistant urges him to apply, and the crowded office makes the offer look promising.

The advertisement allows no written submission. Wilson must submit his application in person and prove that his bright red hair is real. Only after that test does Duncan Ross grant him admission and dismiss the other applicants.

Every morning, Wilson copies pages by hand. He is content with the easy pay, though he must remain in the office. Then the door is locked and a notice says the League has ended. The sudden change troubles him, so he takes the newspaper notice and his story to Sherlock Holmes.

Holmes discovers that the job was a distraction. The assistant wanted Wilson away from his shop while criminals dug toward a bank. To Wilson, the copying seemed like a privilege. To the criminals, it was a timetable: four pounds bought four quiet hours each day. The red-hair rule made the false job seem exclusive, keeping Wilson focused on his good luck while work continued below the shop.

In Wells's story, a visitor with little knowledge of chemistry enters a bacteriologist's laboratory. The scientist shows him samples under a microscope and talks grandly about dangerous bacteria. A sealed tube is described as powerful enough to destroy a city. The visitor listens as if he has found a weapon.

The visitor steals the tube and escapes in a cab. He believes the liquid holds cholera. His mission is to pour it into London's water, so the scientist runs after him without hat or shoes. The chase seems to confirm the thief's belief that he has taken something terrible.

During the chase, the tube breaks. The thief swallows what remains and waits with supreme confidence for a terrible result. The scientist then admits that the sample came from an experiment on a harmless bacterium that turns some animals blue. The expected disaster becomes a private and foolish surprise.

The ending leaves a simple lesson: the visitor never verifies what is inside the tube. Once the scientist gives chase, he becomes absolutely certain that he has stolen a weapon. He calls the sample dangerous on the strength of a label, a confident voice, and the pursuit. The truth arrives only after his plan has collapsed.

In 1981, a national competition selected Maya Lin's design for the Vietnam Veterans Memorial. Two polished black granite walls would sink into the ground and meet in a V. The names of the dead and missing would run in chronological order, while the surface reflected each visitor beside them. The two arms also pointed toward major memorials already standing in Washington.

The proposal won among 1,421 entries, yet its form caused a significant dispute. Lin was a twenty-one-year-old architecture student when she entered the anonymous competition. Some critics wanted a recognisable human figure and objected to the black stone and cut in the earth. The memorial's chief organising idea was absence: no battle scene, only names, dates, and the living reflected among them.

The wall opened in 1982. A compromise followed, but it did not replace Lin's work. Frederick Hart's bronze Three Servicemen statue and a flagstaff were added nearby in 1984. The figures face the wall, so the newer element directs attention back to the original monument. Their placement keeps the addition in conversation with the wall rather than making it a separate memorial.

That sequence gives the site's evolution lasting significance. The wall asks visitors to encounter individual names; the statue offers the human form some critics had requested. Their distance preserves the disagreement in physical space. Visitors can move between two visual languages without pretending that the argument ended in a single answer. The result records both the selected design and the public argument that followed it.

In 1766, Henry Cavendish isolated what he called 'inflammable air'. The gas burned readily. Later experiments produced a small amount of dew when that air burned with ordinary air inside a closed glass vessel.

Cavendish identified the dew as water, but he explained it through the older theory of phlogiston. Antoine Lavoisier approached the result from another direction. In 1783, he reacted inflammable air with oxygen and obtained very pure water.

Lavoisier then worked backwards. He used hot iron to separate water into gases and showed that one product burned. The paired operations—making water and breaking it apart—gave him a stronger basis for rejecting water as an element. He later named the burning gas hydrogen, or 'water-former'.

A modern classroom test keeps only a small part of that history. A piece of metal reacts with an acid solution and generates hydrogen in a tube. When the collected gas is exposed to the flame of a lit splint, it produces a short pop. That result helps identify hydrogen. Safety depends on testing only a small sample after the apparatus has been checked.

The historical and classroom investigations answer related but different questions. Lavoisier used linked experiments to change a theory about water. The classroom pop checks the identity of one prepared sample. A separate rusting investigation must monitor iron with and without water and oxygen; a dramatic sound cannot solve that causal question. The method must match the claim being tested in each case.

The words ‘120 calories’ may promise a light snack when they appear in large print. The figure looks precise, yet a reader still needs to ask what amount it describes. On a Nutrition Facts label, the answer usually begins with the serving size.

Serving size is based on the amount people typically eat, not on an official recommendation. A packet can hold more than one serving. If someone eats the whole packet, the listed nutrient content per serving must be connected to the number of servings consumed.

Percent Daily Value answers a different question. It shows how much a nutrient in one serving contributes to a daily diet. Ten per cent does not signify that the nutrient fills ten per cent of the package in the reader's hand.

Some products use two columns: one for a serving and another for the whole container. That layout makes the two calculation bases visible together. It is useful when people may finish the package at one time, but it does not decide whether the food suits a particular person. The columns clarify arithmetic, not personal advice.

The label becomes easier to use when each number stays attached to its basis. First identify the serving, then the number of servings, and only then compare nutrients or calories. The small line near the top can change the meaning of the largest number on the front. Reading in that order prevents a precise figure from losing its scale.

In 1951, doctors took cells from Henrietta Lacks's cervical tumour during treatment at Johns Hopkins Hospital. She did not know that the sample would be used for research. The cells became the first human cell line that could be stably cultured, and laboratories across the world later used HeLa cells in a vast range of studies.

The scientific history created an ethical inheritance. Scientists can copy a cell line for experiments long after the person who supplied the tissue has died. A gene sequence from those cells may also carry information connected to a later generation of relatives. The research object is therefore not private in the same way as a sealed personal letter, yet its data are not free of family consequences.

That tension became urgent when full HeLa genome sequences were prepared for publication. In 2013, NIH met with members of the Lacks family and announced an agreement for controlled access. Researchers could apply to use the whole-genome data for health-related work, while family representatives joined the group reviewing requests.

The process does not give the family an unrestricted veto over all HeLa research. It creates a defined decision route for data in an NIH-controlled database. Applicants state their proposed use, accept terms, and agree to acknowledge Henrietta Lacks and her family. The NIH Director makes the final access decision after recommendations from the working group. This shows a general limit: review participation did not confer final authority. The distinction matters because participation can shape a decision without becoming the decision itself.

The case also reveals why genomic privacy remains uncertain. Removing a name may erase the most obvious sign of identity, but DNA is highly distinctive and can sometimes be reconnected with people through other records. Researchers cannot be certain that future privacy will be protected. A genuine consent discussion must therefore address future access and reuse, not merely the first laboratory study. Rules for a government repository may also differ from those of a private consumer service.

NIH reaffirmed the agreement in 2023. Its value lies partly in the record it leaves: who may request the data, who reviews the request, and which promises accompany use. That record signals where responsibility now lies. The agreement cannot repair the absence of Henrietta Lacks's original consent. It can make later responsibilities more visible and keep the family's voice inside a research system that had generally treated the cells as detached from her story.

The recycling symbol suggests a clean circuit. An aluminium drink container enters a bin and appears to return as another can. That route is technically possible, but collection is only the opening gate. A recovered can can be recycled into another aluminium product and still leave the can-to-can loop.

International Aluminium Institute estimates for 2019 separate three measurements. About 71 per cent of cans placed on the market were recycled. Roughly 33 per cent returned to the market as new cans. Among cans that were recycled, about 47 per cent completed that narrower cycle.

The remaining metal followed other routes. Some moved into products such as engine blocks. Yet alloys suitable for a cast component may not suit thin can sheet. Once different streams are mixed, added elements can make later separation difficult, so a useful second life may decrease the material available for future cans.

Can design itself can involve several alloys. Bodies, lids, and tabs need different properties. Sorting and controlled blending can increase the share that manufacturers circulate back into can sheet. The IAI estimates that existing systems could achieve a much higher can-to-can share without changing current alloys or remelting technology, if material flows were better managed.

This is why one percentage cannot describe every achievement. Collection rate asks how much entered recovery. Recycling rate asks how much became usable material. Can-to-can rate asks how much returned to the same product system. Each figure answers a different question about the route. A percentage is useful only when its denominator is clear.

A strong public claim therefore names its stage, location, and year. More cans in bins may improve collection while leaving sorting losses untouched. Conversely, a better closed loop may emerge without a dramatic change in the number collected. Neither change automatically proves the other. The familiar symbol becomes more informative when readers can follow the metal through each gate. Treating the circle itself as proof hides where losses occur.

When a government faces a technical risk, it may assign an independent panel to examine evidence. The panel's task is to clarify what is known, what remains uncertain, and what consequences may follow. Elected ministers then decide policy alongside legal, economic, and social considerations.

The division is basic. Yet the task becomes increasingly challenging when evidence changes quickly. Scientific advice can narrow uncertainty, but it does not carry absolute authority over public values. Political authority, in turn, cannot make a preferred factual claim superior to the measured evidence. Each role has power, but neither can quietly take over the other's work.

UK principles seek to protect both roles. Advisers should be free from political interference and, subject to legitimate confidentiality, able to communicate their advice publicly. Government should not prejudge or criticise that advice before publication. If policy departs from it, ministers should explain the decision and represent the evidence accurately. Publication gives outsiders a chance to compare the advice with the choice made afterward.

Disagreement may still continue after publication. Its existence does not show that either side is certainly wrong. The Code of Practice for Scientific Advisory Committees (CoPSAC) says a committee chair should first discuss with the sponsoring body how the advice has been interpreted. The aim is to locate the dispute precisely: does it concern the evidence, the wording of advice, or the policy trade-off made afterward? Different answers call for different forms of clarification.

If the parties cannot resolve the problem, the code provides an escalation route through the departmental Chief Scientific Adviser or another agreed channel. That process does not guarantee a shared resolution. It requires each side to leave reasons that can be examined, preventing an unclear disagreement from hardening into personal accusation. Escalation changes who helps examine the dispute; it does not change the evidence by itself.

The framework's value is therefore procedural. Advisers own the quality and limits of their analysis; ministers own the final trade-off. Public trust does not demand that the two sides always agree. It demands a record clear enough to show where scientific judgement ended, where policy judgement began, and which question remains open to later review.