(   ) 3. Which of the following is true?

A.     Big cities are not safe and clean enough

B.      People can easily find a good place to live in big cities

C.      Big cities are safe, but not clean

D.     All people like to live in big cities

(    ) 2. In big cities people can_______

A.     go to different kinds of museums

B.      see all kinds of plays and films

C.      buy things from all over the world

D.     A, B and C

(    ) 1. Which is the best title（标题）for this passage.

A.     Big cities

B.      New York, London, and Paris

C.      Exciting Places to Live in

D.     Serious Problems in Big Cities

(    ) 5. After reading this, we can learn that _______

A.     plants can keep dry land from becoming desert

B.      it is good to get rid of the grass in the deserts

C.      all places without much rain will become deserts

D.     it is better to grow crops（谷物）dry land than to grow grass

New York, London, Paris and other big cities are exciting places to live in. There are many interesting things to see and to do. You can go to different kinds of museums, plays and films. You can also go shopping to buy things from all over the world.

But there are serious problems in big cities too. The cost of living is high, and there are too many people in some of big cities. Every year many people move to the cities because there are some chances to find jobs, to study at good schools, and to receive good medical care. But sometimes these people can’t find work or a good place to live in. Also, too many people in a small space make it hard to keep the cities safe and clean.

Some people enjoy living in big cities. Others do not. Before people enjoy move to big cities, they should think about the problems of living there.

(    ) 4. Which is the main（主要的）idea of the first paragraph?

A.     Scientists know how to change desert into good land

B.      Land is becoming desert faster than scientists can change it back into good land

C.      If scientists can bring water to desert, people can live and grow food there

D.     More and more places are becoming deserts all the time

(    ) 3. Land is becoming desert little by little because________

A.     plants can’t grow there

B.      there is not enough rain

C.      people haven’t done what scientists wish them to do

D.     scientists know little about the deserts

(    ) 2. Small green plants are very important to dry places because______

A.     they don’t let the sun make the earth even drier

B.      they don’t let the wind blow the earth away

C.      they hold water

D.     all of the above

(     ) 1. Deserts________

A.     get very little rain

B.      never have any plants or animals in them

C.      can all be turned into good land before long

D.     both A and C

 (    ) 5. Which of the following sentences isn’t true?

A.     Shaking the head doesn’t always have the same meaning in different countries.

B.      When an Indian shakes his head, he really means Yes.

C.      In India the word No means Yes.

D.     In India shaking the head means No.

Scientists are trying to make the deserts（沙漠）into good land again. They want to bring water to the deserts, so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming desert all the time. Scientists may not be able to change the deserts. People are bad things to the earth.

Some places on the earth don’t get much rain. But they still become deserts. This is because some green plants are growing there. Small green plants and grass are very important to dry places. Plants don’t let the wind blow the soil（土壤）away. When a bit of rain falls, the plants hold the water. Without plants, the land can become a desert much more easily.

(    ) 4. India is _______

A.     a developed （发达的）country

B.      in America

C.      next to Australia

D.     to the southwest of China