Scientists are trying to make the deserts ,which get very little rain, 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 desert in time．
Why is more and more land becoming desert？Scientists think that people make deserts．People are doing bad things to the earth against the scientists’ wish．
Some places on the earth don’t get much rain. But they still don’t 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 sun make the earth even drier． Plants do not let the wind blow the dirt away．When a bit of rain falls，the plants hold the water. Without plants, the land can become desert more easily．
1.Deserts ____________ ．
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A．never have any plants or animals in them |
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B．can all be turned into good land before long |
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C．are becoming smaller and smaller |
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D．get very little rain |
2.More and more land is becoming desert because____________．
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A．plants can’t grow there |
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B．there is not enough rain |
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C．people haven’t done what scientists wish them to do |
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D．scientists know little about the deserts |
3.Small green plants are very important to dry places because ________
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A．they don’t let the sun make the earth even drier |
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B．they don’t let the wind blow the soil away |
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C．they hold water |
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D．All of the above． |
4.After reading this passage, we learn that _____________ ．
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A．plants can keep dry land from becoming desert |
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B．it is good to get rid of the grass in the deserts |
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C．all places without much rain will become deserts |
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D．it is better to grow crops on dry land than to cut them |
Bill White’s father is a lawyer. In his 56 time, he likes to get out in the country and take some 57 of animals.
For a long time, Bill had wanted to go with his father on one of his 58 . But his father didn’t take Bill along with him 59 he was fifteen.
He and Bill drove to the farm which 60 to his uncle in the afternoon. They 61 the night there, so that they could 62 out early the next morning. Uncle Steve and his son Larry, who was sixteen, were going to go out with them.
It was still dark when Bill heard the alarm 63 the next morning. He wondered why it was running so early. He couldn’t remember 64 he was. He turned over __65__and looked at the clock. It was 5 o’clock. Then he 66 that he was at the 67 and that he was going out to take pictures with his father. He jumped out of bed and got 68 quickly.
He ran downstairs. The others were already in the 69 ,where Uncle Steve was cooking bacon and eggs. There was a pot of coffee on the stove. It 70 good.
They ate breakfast quickly. They didn’t talk 71 , because they didn’t want to __72__ up the other people in the house. They filled a thermos bottle(热水瓶) 73 hot coffee and took some sandwiches 74 Aunt Grace, Uncle Steve’s wife, had made for them. They gathered their camera 75 and started out.
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I can’t remember the day ______ we first met in China.
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A．which |
B．that |
C．when |
D．in which |
The boy ________ the father worked in the USA is Jack.
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A．whose |
B．of whom |
C．who |
D．whom |
Is this the school _______ you worked last year?
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A．where |
B．that |
C．the one |
D．which |
Is this school _____ you visited last year?
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A．where |
B．that |
C．the one |
D．which |
