Scientists （科学家） 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 deserts all the time. Scientists may not be able to change the deserts. Scientists think that people make deserts. People are doing bad things to the earth.
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 helpful to dry (干旱的)places. Plants don’t let the hot sun make the earth even drier. Plants don’t let the wind blow the earth away. When a little bit of rain falls, the plants hold the water. Without plants, the land can become deserts much more easily.
1.Why can the land become deserts?
A. Some places don’t get much rain.
B. Plants don’t let the hot sun make the earth even drier.
C. People don’t keep the earth well.
D. Scientists haven’t learnt enough about the deserts.
2.Scientists are to make the deserts into good land again.
A. carrying water B. growing food C. doing nothing D. studying a lot
3.Which is NOT true?
A. The land never stops becoming deserts.
B. Scientists ask people to live in the deserts and grow food there.
C. People do bad things to the earth.
D. Scientists may not be able to change the deserts.
4.Why are green plants and grass helpful?
A. They can hold the water.
B. They can keep the earth wet.
C. They can stop the wind from blowing the earth away.
D. All the above.
5.Which is the best title（题目）for the passage?
A. The Desert Problem
B. People Make Deserts
C. Green Plants and Grass
D. The Deserts, the Tree and the Water
Birds live in the trees. Squirrels（松鼠） live in the trees. But do you know that some frogs（蛙） live in the trees, too?
The tree frog is hard to find. It can change colors. On green leaves, it stays green. On a brown branch（树枝）,it turns brown. Some tree frogs can change from green to gold（金黄色） or blue.
Tree frogs have legs and wide feet. They have sticky pads（黏性的肉趾） at the end of their toes. These sticky toe pads keep the tree frogs from falling off the trees. Tree frogs have different colors and markings（斑点） on their skins. Their eyes are different, too. Some have green eyes, and others have bright red ones.
The sounds they make are different, too. One frog makes a sound like a dog barking（狗吠）.Another frog makes a loud noise like a snore（打鼾）.There is even a frog that whistles（吹口哨）！
1. According to the passage, these frogs are hard to find because________.
A. they stay in trees B. they can change their colors
C. they have sticky pads D. they make surprising sounds
2. The color of tree frogs on green leaves is________.
A. gold B. brown C. green D. blue
3.What sounds can the frogs make?
A. like a dog barking B. like a snore
C. like a whistle D. A,B and C
4. Which of the following sentences is RIGHT?
A. The tree frogs have different colors and markings on their skins.
B. The tree frogs can’t make a loud noise like a snore.
C. We can easily tell tree leaves from tree frogs.
D. We still can’t find tree frogs if we hear a sound like a snore in the forest.
5. The passage is mainly about________.
A. the colors of a special frog B. the sounds of a special frog
C. the eyes of a special frog D. something about tree frogs
While I ________to the programs, my mother ________outside.
A. listened; was washing B. was listening; washed
C. was listening; was washing D. was listening; is washing
It ______ the workers about 20 months to build the Huhang highspeed railway.
A．took B．spent C．cost D．paid
Of all the students, Li Lei is _______to Mr Wang.
A. close B. closer C. the closest D. the most closest
There are a lot of _______friends.
A. way to make B. ways of make C. ways to make D.way making
