We are wondering ________ we can prevent people from polluting the earth.

   A. who    B. that    C. whether     D. what

 

先阅读短文，然后根据短文内容从方框内所给的单词中选择恰当的词（注意词形变化）填入短文空白处，使短文完整、通顺。一词只用一次，一空限填一词。方框中有两个词是多余的。将能填入空白处的答案写在答题卡上的相应题号后。

The world itself is becoming much smaller by using modern traffic and modern communication. Life today is much    【小题1】   than it was hundreds of years ago, but it has brought new problems. One of the biggest is    【小题2】    . To pollute means to make things dirty. Pollution comes in many ways. We see it, drink it and even hear it.
Man has been polluting the earth. The more people are, the more pollution is. Many years ago, the problem was not so 【小题3】    because there were not so many people. When the land was    【小题4】  up or the river was dirty in a place, men moved to another one. But this is no    【小题5】     true. Man is now slowly pollution the   【小题6】   world.
Air pollution is still the most serious. It’s bad to all living things in the world, but it is not    
【小题7】  one kind of pollution. Water pollution   【小题8】    our fish and pollutes our drinking water. Noise pollution makes us become angry more easily.
Many countries are making rules to    【小题9】    pollution. They stop the people from burning coal in houses and factories in the city, and from blowing dirty smoke into the air. The pollution of SO2 is now the most dangerous problem of air pollution. It is caused by heavy traffic. It is certain that if there are fewer people driving, there will be   【小题10】   air pollution.
The earth is our home. We must take care of it. That means   【小题11】    the land, water and air clean.

Americans can travel almost anywhere they choose. But to protect (保护) its people, the government lists a few dangerous places where Americans cannot go. These places are unfriendly countries or countries at war. There, the travelers might not be safe. These countries are listed in a small book called a passport (护照).

This passport is for the safety of its traveling people. It is also a government’s pledge (保证) that the people will follow the rules of the host country. To receive a passport from the government, a traveler must show that he is an American citizen (公民). An American cannot go abroad without a passport. Only the close countries such as Canada and Mexico do not ask for passports. The traveler’s picture is inside the passport. Children traveling with their parents are also in one parent’s book.

Thousands of people from the United States visit other countries every year. An American traveler might carry plane tickets, money, clothing and many other things. But the most important thing that he carries in another country is his passport.

1.Why does a traveler need a passport?

    A. It helps to protect the people.              B. It helps to know where he will go.

    C. He needs to take pictures often.             D. He needs to carry more when he travels.

2.A passport is not needed when an American goes to       .

    A. European countries   B. Dangerous areas      C. Canada or Mexico D. Russia and China

3.We believe       .

    A. some countries don’t ask for passports       B. people should look after their passports

    C. money is more important than a passport      D. children are never in a passport

4.We can know from the text that       .

    A. Americans travel abroad a lot                B. a traveler is not safe in most countries

    C. children can’t travel abroad             D. Americans abroad only need a passport