For years scientists have been concerned about the effects of air pollution on the earth's natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.
Indoor air pollution can cause a person to feel tired,to suffer eye pain, headache and other problems.Some pollutants(污染物)can cause breathing disorders,diseases of blood and even cancer. Most scientists agree that every modern house has some kind of indoor pollution.People began to notice the problem in the early 1970s.It is said that when builders began making houses and offices they did not want to waste energy.To do this,they built buildings that limited the flow of air between inside and outside.They also began using man-made building materials.These materials are now known to let out harmful gases.As the problem became more serious, scientists began searching for a way to deal with it.They discovered a natural pollution control system for building－green plants.Scientists do not really know how plants control air pollution.They believe that a plant's leaves absorb or take in the pollutants.In exchange the plant lets out oxygen through its leaves and through its tiny organizations on its roots.Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square metres of space.Studies of different plants show that each absorbs different chemicals.So the most effective way to clean the air is to use different kinds of plants.Having green plants inside your house can make it a prettier and healthier place.
77.What is the topic of the passage?
A.Air pollution.           
B.Green plants indoors.
C.Indoor air pollution.         
D.Environment protecting.
78.What makes indoor air pollution more harmful than that of the air outside?
A.The limited flow of air indoors.
B.Man-made building materials.
C.Fewer green plants inside houses.     
D.The energy-saving materials indoors.
79.The most effective way to clean the air is to use different kinds of plants because______.
A.they can make houses pettier and healthier
B.they may let out oxygen which people need
C.they can take in all kinds of indoor pollutants  
D.they can absorb different harmful indoor chemicals
80.Which of the following is implied but NOT stated?
A.keep windows open and let fresh air in.
B.Scientists have a clear idea how plants control air pollution.
C.Oxygen is let out through the leaves and roots of the plants.
D.Green plants are a natural pollution control system for building.

读写任务（满分25分）
阅读下面的短文，然后按照要求写一篇150词左右的英语短文。
Throughout history man has changed his physical environment in order to improve his way of life. With the tools of technology he has altered（改变）many physical features（特征）of the earth. He has transformed（完全改变） woodlands and prairies（大草原） into farms and made lakes and reservoirs（水库） out of rivers for irrigation purposes or hydroelectric power（发电站）. Man has also modified（修改） the face of the earth by draining marshes(排干沼泽) and cutting through mountains to build roads and railways.
However, man's changes to the physical environment have not always had beneficial（有利的）results. Today, pollution of the air and water is an increasing danger to the health of the planet. Each day thousands of tons of gases come out of the exhausts of motor vehicles. Smoke from factories pollutes the air of industrialized areas and the surrounding areas of the countryside. The pollution of water is equally harmful. The whole ecological（生态的） balance of the sea is being changed and industrial wastes have already made many rivers lifeless.
Now environmental protection is more pressing than ever before. As we know, massive destruction（毁灭）of environment has brought about negative effects and even poses a great threat (威胁)to man's existence. Indifference to these problems will mean committing suicide. Therefore, effective measures should be taken and laws passed to conserve（保护） environment. Otherwise, man is certain to suffer from the serious consequences（后果）caused by this lack of care for his living surroundings.
[写作内容]  
以约30个词概括短文的要点；然后以约120个词就“如何保护地球环境”
这一主题发表看法，并包括如下要点：
作业应正、反面纸都使用，不要浪费纸张；
尽可能不使用一次性物品，提倡循环使用；
应根据自己实际饭量买饭，避免剩饭剩菜造成浪费；
破旧衣服可以继续使用，既节约又不给环境增加污染源。
[写作要求]    可以使用实例或其它论述方法支持你的论点，也可以参照阅读
材料的内容，但不得直接引用原文中的句子。
[评分标准]  概括准确、语言规范、内容合适，篇章连贯。

The hole in the earth's protective ozone layer（臭氧层）won't repair itself until about two decades later than had been expected, scientists announced.
The ozone layer blocks more than 90 percent of the sun's ultraviolet radiation（紫外线辐射）, helping to make life on Earth possible. For many dacades, ozone was depleted（削减） by chlorine and bromine gas in the air. A hole in the ozone layer formed over the Southern Hemisphere.
Computer models had forecast that the hole would fill back in by 2050. An improved computer model forecasts the recovery won't occur until 2068. The model, fed with fresh data from statellites and airplanes, was supported by the fact that it accurately reproduced ozone levels in the Antarctic stratosphere（平流层）over the past 27 years.
The ozone hole is actually more of a broad region with less ozone than ought to occur naturally. It is not limited to Antarctica, as is often believed.
Over areas that are farther from the poles like Africa or the US, the levels of ozone are only three to six percent below natural levels. Over Antarctica, ozone levels are 70 percent lower in the spring. This new method allows us to more accurately estimate（估计）ozone-depleting gases over Antarctica, and how they will decrease over time, reducing the ozone hole area.
Paul Newman, a scientist,said that the ozone hole has not started to become smaller as quickly as expected. They figure it will not become much smaller until 2018, after which time the recovery should proceed more quickly. And the hole will not be filled in again until 2065.
【小题1】According to the passage, the ozone layer _______

Two magazines recently listed the best cities to live in. Here are two of the cities listed as “the world’s best.”
SAN JOSE, COSTA RICA  The city has comfortable weather all year round (15°C to 26°C ). Housing is not very expensive in San Jose. Also, many of the city’s older neighborhoods are very beautiful and have small hotels and cafés(咖啡馆). Beautiful mountains are around the city. You can visit them easily from San Jose. So lots of people go sightseeing there every year. But air pollution is a problem in the city center.
HONG KONG, CHINA This lively city—once a small fishing village—is today an international business center. It is an interesting mix of East and West, old and new. Modern tall buildings are next to small temples (庙宇). Popular nightclubs are close to traditional teahouses. Busy people fill the streets at all hours of the day. But outside the city, there are parks for walking or relaxing. Hong Kong is famous for its wonderful native dishes. There’s also food from Europe, North America, and other parts of Asia. However, this small city has a large population. Nearly seven million people live in Hong Kong! That’s why housing is often very expensive. Traffic and air pollution are also a problem.
56. Which of the following is not mentioned about San Jose?
A. The weather.                B. The mountains.        C. The air.        D. The traffic.
57. What makes Hong Kong the world’s best according to this passage?
A. The lively city and the wonderful dishes. B. The beautiful mountains and the lively city.
C. The expensive housing and the food.          D. The city and the people.
58. The writer thinks housing in Hong Kong is expensive because     .
A. it was a small fishing village            B. it is a mix of East and West
C. it is famous for its wonderful food      D. there are too many people in the city
59. What do the two cities have in common?
A. They both have beautiful mountains.    B. They both have a large population.
C. Air pollution is a problem in both.       D. They are both crowded.
60. From the passage, we can know that     .
A. San Jose and Hong Kong are the only two cities of the world’s best
B. San Jose has more natural sights than Hong Kong does
C. the weather in both cities is fine
D. Hong Kong is the more popular city of the two

Thirty-two people watched kitty Genovese being killed right beneath their windows. She was their neighbor. Yet none of the 32 helped her. Not one even called the police. Was this in gunman cruelty? Was it lack of feeling about one’s fellow man?
Not so, say scientists John Barley and Bib Fatane. These men went beyond the headlines to probe（探查） the reasons why people didn’t act. They found that a person has to go through two steps before he can help. First he has to notice that is an emergency(紧急情况).
　　Suppose you see a middle-aged man fall to the side-walk. Is he having a heart attack? Is he in a coma （昏迷） from diabetes（糖尿病）? Or is he about to sleep off a drunk?
Is the smoke coming into the room from a leak in the air conditioning? Is it steam pipes? Or is it really smoke from a fire? It’s not always easy to tell if you are faced with a real emergency.
　　Second, and more important, the person faced with an emergency must feel personally responsible. He must feel that he must help, or the person won’t get the help he needs.
The researchers found that a lot depends on how many people are around. They had college students in to be tested. Some came alone. Some came with one or two others. And some came in large groups. The receptionist started them off on the tests. Then she went into the next room. A curtain divided the testing room and the room into which she went. Soon the students heard a scream, the noise of file cabinets falling and a cry for help. All of this had been pre-recorded on a tape-recorder.
Eight out of ten of the students taking the test alone acted to help. Of the students in pairs, only two out of ten helped. Of the students in groups, none helped.
In other words, in a group, Americans often fail to act. They feel that others will act. They, themselves, needn’t. They do not feel any direct responsibility.
Are people bothered by situations where people are in trouble? Yes. Scientists found that the people were emotional, they sweated, they had trembling hands. They felt the other person’s trouble. But they did not act. They were in a group. Their actions were shaped by the actions of those they were with.
【小题1】The purpose of this passage is_________.