Cloze test

There are many problems in the world, but the population problem may be the1 one of the world today. The world's population is growing 2 .Two thousand years ago, there were only 250 million people on the 3 Four hundred years ago, the number was 4 500 million. But at the beginning of the 5 century, the world's population was about 1,700 million. In 1970, this number was 3,600 million. In 1990, the number was five billion. A UN 6 said that the world's population had 7 six billion by the end of the 21th century. This is just ten 8 after it 9 five billion. People say that by the year 2010, 10 may be seven billion.

阅读理解

　　For thousands of years men have dreamed about going to the moon. Now men have landed on it but living there will not be easy, because the moon is a dead world without air or water.

　　Man has lived on the earth under very hard conditions. At the South Pole (南极) men have lived for many months in temperatures of 75 to 100 degrees below zero centigrade.

　　Living on the moon will be even harder than living at the South Pole. Each night is two weeks long and the temperature drops to 200 degrees below zero centigrade. Each day is two weeks long, but the temperature rises to 200 degrees above zero.

　　If man hopes to live on the moon he will have to make his houses there strong and airtight (密封的).Instead of building up, he will have to dig below the moon's surface (表面) and live underground. The first men on the moon had to carry their own air, water and food with them from the earth. Later when men live on the moon, spaceships will have to keep bringing in more supplies. Many years later, man might be able to find ways to get his air, food and water supplies from the moon itself.

1．Choose the best title of the text.

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2．A night on the moon ________.

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3．Temperatures on the moon are ________.

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A．changing with the four seasons

B．quite different in different places

C．the same all the time

D．very high in the day and very low at night

4．Houses on the moon will have to be made below the moon's surface so that men can ________.

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A．keep getting water from underground

B．keep the air from rushing out

C．live underground

D．keep the heat and cold out

5．From the text we can infer (推断)________.

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A．living on the moon is impossible

B．to live on the moon we must find ways to keep on getting air, water and food

C．man is likely to live on the moon if rich enough

D．air, water and food are due to be found on the moon