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2. She can ______ (几乎不) walk any longer.
3. He can't go to school because of his ______ (病).
4. What's the matter w______ her?
5. Do you want to go f______ this weekend?
6. The ______ (旅客) are going to visit the Great Wall.
7. She wants to be an actress when she g______ up.
8. During the summer v______, my family will go to Qingdao for sightseeing.
9. We should keep the ______ (平衡) of nature.
10. There's no ______ (不同) between the two boys.
Not many years ago, some farmers were worried because hawks
（鹰）were taking many of their chickens. The farmers did not know what to do. Finally they went to the county officials and asked for help.“Kill the hawks,”the officials said,“We’ll even pay you for them.”So the farmers began to think of ways to kill the hawks. The farmers killed many hawks. They no longer had to worry about their chickens. But they now had a new worry. Field mice were eating up a lot of the farmers’ grain. How did this happen? Hawks eat not only chickens but also field mice. They eat more field mice than chickens. But the farmers did not know this. When they killed a lot of hawks, they changed the balance（平衡）of nature.When people move into a new place, they often destroy many wild plants. Often these plants are food for the animals. If the animals cannot find enough plants to eat, they will starve or have to leave the place. In one part of the United States, for example, the deer there like to eat a certain kind of wild rose. The mountain lions there eat the deer. The number of deer, mountain lions, and wild roses does not change much if people leave things as they are. But people killed many mountain lions in order to protect the deer. Soon there were so many deer that they ate up all the wild roses. Then the deer began to eat the green leaves of young trees. These trees were important to the farmers. So the farmers thought of ways to protect their trees. Now the deer had nothing to eat, and many of them died. This was another lesson for nature.
To keep the balance of nature is important for us to remember.
根据短文内容判断正（
T）误（F）(1) Some of the farmers was worried because hawks were taking many of their chickens.
( )
(2) The farmers went to their neighbors and asked for help.
( )
(3) The farmers’ new worry was that field mice were eating up a lot of their grain.
( )
(4) If animals can’t find enough plants to eat they will kill themselves.
( )
(5) The lesson we should remember is that it is important to keep the balance of nature.
( )
查看习题详情和答案>>Scientists were surprised that the plant had cured the chimp. Did the chimp know the plant would make him feel better? Or was it just a lucky accident?
Many scientists don't think it has anything to do with luck. Some animals seem to use plants to “cure” the mselves. And these animals are leading scientists to new plants that could cure humans! Some scientists agree that animals may know something we don't about forest plants.
Animals have their own feeding habits. Chimps eat fruit every morning, then they eat leaves. Sometimes they walk for 20 minutes to find the plant and eat the bitter(苦味的) leaves while closing eyes.
Scientists found the leaves contain( 含有)a red oil that kill different parasites and viruses (寄生虫和细菌). And later on, tests showed that the oil might fight cancer and the AIDS virus.
1．What made the sick chimp get well? ( )
A．Some medicine.
B．Some leaves.
C．Some delicious food．
D．Some trees.
2．How the chimps ate the leaves? ( )
A．They had to have them with fruit.
B．They ate them,climbing up and down.
C．They ate them,closing their eyes.
D．They ate them with surprising feelings.
3．How do chimps know which plants will cure them? ( )
A．Their parents teach them.
B．The scientists tell them.
C．Other animals lead them.
D．We don't know.
4．What's the meaning of “to do with luck”? ( )
A．与运气有关
B．交好运
C．好运常来
< span lang=EN-US style='mso-bidi-font-size:10.5pt; color:black'>D．没运气
5．Which of the following is right, after reading this text? ( )
A．Humans should cut all of kinds of trees to find out what is good for health．
B．Scientists should taste every leaves to discover(发现)which is useful to humans．
C．All plants and animals should live together on the earth to keep the nature balance(生态平衡)．
D．Humans could follow the animals to live in the forests．
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