题目
题型：不详难度：来源：
What has destroyed part of the ozone layer? Scientists do not know for sure. They suspect that our popular spray cans (喷漆罐) have played a part in the damage. Many spray cans contain dangerous gases. These gases might have destroyed the ozone layer fifteen miles above the earth’s surface, The chemicals used in refrigerators (冰箱) and air conditioners may contribute to the problem, too.
Many scientists believe that the destruction of the ozone layer is a serious problem for people everywhere. Global warming could change weather patterns around the world. Farmers and ranchers(牧场主) could find it more and more difficult to produce enough food for the earth’s people. If more of the sun’s dangerous rays reached the earth, there also could be an increase in skin cancers. Some skin cancers might cause people to die. Although some scientists do not believe there is a serious danger, obviously no one wants to take any chance on such a possibility.
Can scientists repair the hole in the ozone layer? They really don’t know the answer to that question. Can people do anything to save the ozone layer that the earth still has? Scientists stress the need to limit the use of spray cans and other items that contain the dangerous gases. This will not be an easy task. People all over the world use these items. Solving the problem certainly will require commitment and cooperation from everyone.
小题1:The ozone layer exists to _____.
| A．warm the earth to a proper level for life |
| B．protect the earth from dangerous sun rays |
| C．make all life on the earth in a dangerous situation |
| D．prevent human beings from being harmed from the earth |
| A．Scientists aren’t sure what has destroyed part of the ozone layer. |
| B．Scientists recently have discovered a hole in the Antarctica. |
| C．Scientists prove that spray cans have destroyed part of the ozone layer. |
| D．Global warming doesn’t affect weather patterns around the world. |
| A．spray cans | B．refrigerators | C．ranchers | D．air conditioners |
| A．scientists are badly in need of others’ help |
| B．items containing dangerous gases should be forbidden |
| C．scientists can’t afford so much money to take measures |
| D．people all over the world use items containing dangerous gases |
答案
小题1:B
小题2:A
小题3:C
小题4:D
解析
试题分析：臭氧层是地球最好的保护伞，它吸收了来自太阳的大部分紫外线。臭氧层空洞的扩大将导致紫外线辐射加强，这不仅会严重破坏地球表面生态环境，同时也会增加人类患皮肤癌的危险。
小题1:细节题：从第一段的句子：This “blanket” protects the earth from dangerous rays produced by the sun. 可知臭氧层是用来保护地球免受太阳的有危险的光的伤害。选B
小题2:细节题：从第二段的句子：What has destroyed part of the ozone layer? Scientists do not know for sure. 可知科学家还不知道是什么破坏了臭氧层的一部分，选A
小题3:细节题：从第二段的句子：They suspect that our popular spray cans (喷漆罐) have played a part in the damage. 和The chemicals used in refrigerators (冰箱) and air conditioners may contribute to the problem, too. 可知喷漆罐，冰箱和空调都有可能破坏臭氧层，没有提到ranchers，选C
小题4:细节题：从最后一段的句子：People all over the world use these items. Solving the problem certainly will require commitment and cooperation from everyone. 可知保护臭氧层人人有责，因为人人都在用含有危险气体的东西。选D
核心考点
试题【The ozone layer(臭氧层) is a thin layer of gas around the earth. It forms a special】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
It is always more important to know how to study by oneself than to learn some facts or a formula by heart. It is actually quiet easy to learn a certain fact in history or a formula(公式) in mathematics. But it is very difficult to use a formula in working out a maths problem. Great scientist, such as Einstein, Newton and Galileo, didn’t get everything from school. But they were all so successful and invented so many things for men. They worked hard all their lives, wasting not a single moment. They would ask many questions as they read and they did thousands of experiments.
小题1:According to the passage, a good teacher should be one who is to_________.
| A．help his students to gain a good memory. |
| B．train his students’ ability to learn |
| C．teach his students everything he knows |
| D．have his students studying long hours |
| A．to learn all the useful facts and formula by heart |
| B．to do everything as his teacher have said in class |
| C．to absorb (吸收) as much knowledge from his teacher as possible |
| D．to think more while he is studying |
| A．the teachers who had taught them were all experienced. |
| B．they used to work and study without a moment’s rest. |
| C．they had received more schooling than other people |
| D．they know how to study and worked hard |
| A．We can learn better without teachers |
| B．We should do more asking and thinking while studying |
| C．We should pay enough attention to classroom |
| D．Book knowledge is of little use |
The program allows users to display alerts（警报）on the missing computer’s screen and even to set a spoken message. Tracking software for stolen laptops has been on the market for some time, but this is thought to be the first that allows owners to give the thief a piece of their mind.
Owners must report their laptop missing by visiting to a website, which sends a message to the model: a red and yellow “lost or stolen” sign appears on its screen when it is started. Under the latest version(版本) of the software, users can also send a spoken message.
The message can be set to reappear every 30 seconds, no matter how many times the thief closes it. “One customer sent a message saying, ‘You are being tracked. I am right at your door’,” said Carrie Hafeman, chief executive (主管) of the company which produces the program, Retriever.
In the latest version, people can add a spoken message. For example, the laptop’s speakers will say: “Help, this laptop is reported lost or stolen. If you are not my owner, please report me now.”
The Retriever software package(软件包), which costs $29.95 (￡21) but has a free trial period, has the functions of many security software programs. Owners can remotely switch to an alternative password if they fear that the thief has also got hold of the access details.
If a thief accesses the internet with the stolen laptop, Retriever will collect information on the internet service provider in use, so that the police can be alerted to its location.
Thousands of laptops are stolen every year from homes and offices, but with the use of laptops increasing, the number stolen while their owners are out and about has been rising sharply.
Other security software allows users to erase（删除）data remotely or lock down the computer.
小题1:The expression “to give the thief a piece of their mind” can be understood as “_______”.
| A．to give the thief an alert mind |
| B．to express the owners’ anger to the thief |
| C．to remind the thief of his conscience |
| D．to make the thief give up his mind |
| A．record the stealing process |
| B．help recognize the lost laptop |
| C．lock down the computer remotely |
| D．send a spoken message |
| A．change some access details for switching on the laptop |
| B．turn on the laptop by using the original password |
| C．operate the laptop by means of an alternative password |
| D．erase the information kept in the stolen laptop |
| A．With no Retriever, thousands of laptops are stolen every year. |
| B．A new software provides a means to reduce laptop theft. |
| C．Retriever has helped to find thieves and lost computers. |
| D．A new program offers a communication platform with the thief. |
This summer, 50 million kids will spend much time talking online, watching TV, playing video games and asking older brothers or sisters to take them to the supermarket. They will also be putting their academic futures at risk.
During much of the 20th century, many Americans worked in factories that did not need a college degree but still offered a high salary. Also, in the 19th century, there was no air condition. And poor hygiene (卫生) meant that crowded schools had health risks.
Things have changed. For today’s students, academic skills are key to future success. Many countries don’t give kids an American-style summer vacation. They offer no more than seven consecutive (连续的) weeks of vacation. Most American school districts offer up to 13 weeks. To compete in global marketplace, Americans must be prepared to go up against international competitors.
Summer vacation also causes challenges for today’s families. In the 1960s, more than 60% of families had a stay-at-home mum. Now, two-thirds of American children live families where every adult works. For these families, summer vacation can be more burden than break. Someone must watch the kids.
But the biggest problem may be how summer vacation hurts academic achievement. Scientist have found that disadvantaged students lose important ground in the summertime.
A school year can allow time-limited teachers to conduct richer and more imaginative lessons. Schools would have more time for sports, languages, music and the arts.
小题1:Before the 20th century, a long summer vacation might ______.
| A．reduce income for Americans |
| B．reduce health risks for students |
| C．cause career failure for Americans |
| D．cause loss in global market for America |
| A．No more than two months. |
| B．Less than three months. |
| C．As long as three months. |
| D．As long as four months. |
| A．American students, teachers and parents. |
| B．American students, parents and shop owners. |
| C．American students, parents and international competitors. |
| D．American students, teachers and international competitors. |
| A．One. | B．Two. | C．Three. | D．Four. |
The package itself is of no interest to the shopper, who usually throws it away immediately. Useless wrapping accounts for much of the refuse put out by the average London house-hold each week. So why is it done? Some of it, like the cellophane on meat, is necessary, but most of the rest is simply competitive selling. This is absurd. Packaging is using up valuable energy and resources and polluting the environment.
Recycling is already happening with milk bottles which are returned to the dairies (牛奶场）, washed out, and refilled. But both glass and paper are being threatened by the growing use of plastic. More dairies are experimenting with plastic bottles.
The trouble with plastic is that it does not rot. Some environmentalists argue that the only solution to the problem of ever increasing plastic containers is to throw away plastic altogether in the shops, a suggestion unacceptable to many producers who say there is no alternative (替代品) to their handy plastic packs.
It is evident that more research is needed into the recovery and re-use of various materials and into the cost of collecting and recycling containers rather than producing new ones. Unnecessary packaging, intended to be used just once, and to make things look better so more people will buy them, is clearly becoming increasingly absurd. But it is not so much a question of throwing away packaging as using it wisely. What is needed now is a more advanced approach to using scarce resources for what is, after all, a relatively unimportant function.
小题1:The underlined part “this overuse of wrapping is not limited to luxuries” in Paragraph l means ______.
| A．more wrapping is needed for ordinary products |
| B．the wrapping used for luxury products is unnecessary |
| C．more wrapping is used for luxuries than for ordinary products |
| D．too much wrapping is used for both luxury and ordinary products |
| A．It is easy to use it again. |
| B．Packaged things will not go rotten. |
| C．They want to attract more shoppers. |
| D．Shoppers are all interested in beautiful packaging. |
| A．reusing their paper containers |
| B．giving up the use of glass bottles |
| C．increasing the use of plastic bottles |
| D．experimenting with the use of paper bottles |
| A．too much plastic is wasted |
| B．shops should stop using plastic containers |
| C．no alternative can be found to plastic packaging |
| D．plastic packaging should be made more convenient |
“My family was so frustrated,” admitted town resident Duane Cosby, “We wanted to make this an unforgettable family outing, but it turned out to be a huge disappointment. ”
Astronomers—scientists who study stars and planets—-have been complaining about this problem for decades. They say that light pollution prevents them from seeing objects in the sky that they could see quite easily in the past. They call on people and the government to take measures to fight against it.
There is yet a population besides professional and amateur star observers that suffers even more from light pollution. This population consists of birds, bats frogs, snakes, etc. For example, outdoor lighting severely affects migrating(迁徙的)birds. According to the International Dark-Sky Association. “100 million birds a year throughout North America die in crashes with lighted buildings and towers. ”
Countless more animals casualties(伤亡）result from the use of artificial lighting. Clearly, people enjoy the benefits of lighting their evenings, but some scientists think it can be harmful for humans, too. They worry that exposure to light while sleeping can increase person’s chances of getting cancer.
Emerald Valley is only one community that is becoming aware of the negative effects of light pollution. For years, Flagstaff,Arizona,has enforced lighting regulations in its city in order to assist astronomers at the Lowell Observatory. Similar efforts have been made worldwide, and a movement is underway to remind us to turn off lights when we are not using them, so that other creatures can share the night.
小题1: What is the author concerned about according to Paragraph 4?
| A．Birds may take other migration paths |
| B．Animals’ living habits may change suddenly |
| C．Varieties of animals will become sharply reduced |
| D．Animals’ survival is threatened by outdoor lighting |
| A．Lessen the chance of getting cancer |
| B．create an ideal observation condition |
| C．ensure citizens a good sleep at night |
| D．enable all creatures to live in harmony |
| A．Saving wildlife is saving ourselves |
| B．Great efforts should be made to save energy |
| C．Human activities should be environmentally friendly |
| D．New equipment should be introduced for space study |
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