--Why has he been staying at home these days?

--He ___________ since a month ago.

A. has been out of work　　　　　 B. was out of work

C. has lost his work　　　　　　　 D. had left from his work

 

A

答語中有since引導的時間狀語，限定了句中的動詞為持續(xù)性動詞。

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Botany, the study of plants, occupies a special position in the history of human knowledge. For many thousands of years it was the one field of awareness about which humans had anything more than the vaguest (含糊的) of insight. It is impossible to know today just what our Stone Age ancestors knew about plants, but from what we can observe of pre-industrial societies that still exist, a detailed learning of plants and their properties must extremely ancient. This is logical. Plants are the basis of the food pyramid for all living things, even for other plants. They have always been enormously important to the welfare of peoples, not only for food, but also for clothing, weapons, tools, eyes, medicines, shelter, and a great many other purposes. Tribes living today in the jungles of the Amazon recognized accurately hundreds of plants and know many properties of each. To them, botany, as such, has no name and is probably not even recognized as a special branch of knowledge at all.
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1. Which of the following statements about early humans is expressed in the passage?
A. They probably had extensive knowledge of plants.    
B. They thought there was no need to cultivate crops.     
C. They did not enjoy the study of botany.      
D. They placed great importance on the ownership of property.
2. What does the comment “This is logical.” In the first paragraph mean?
A. There is no clear way to determine the extent of our ancestor’s knowledge of plants.           
B. It is not surprising that early humans had a detailed knowledge of plants.
C. It is reasonable to assume that our ancestors behaved very much like people in pre-industrial societies.       
D. Human knowledge of plants is well organized and very detailed.
3. According to the passage, why has general knowledge of botany begun to fade?
A. People no longer value plants as a useful resource.       
B. Botany is not recognized as a special branch of science.
C. Research is unable to keep up with the increasing numbers of plants.
D. Direct contact with a variety of plants has decreased.
4. In the second paragraph, what is the author’s purpose in mentioning “ a rose, an apple, or an orchid”?
A. To make the passage more poetic.
B. To give an example of plant that are attractive.
C. To give botanical examples that all readers will recognize.
D. To explain the variety of botanical life.
5. According to the passage, what was the first great step toward the practice of agriculture?
A. The invention of agricultural tools and machinery.       
B. The development of a system of names for plants.
C. The discovery of grasses that could be harvested and replanted.         
D. The changing diets of early humans.   

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B. It needs to be replaced by a better one.

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B. giving her mother a lot of trouble.

C. not making good use of time as her mother did.

D. not making any breakthrough in her field.

4. What can be inferred from the last paragraph?

A .The mother is successful in her career.

B. The family members like traveling.

C. The author had little time to play when young.

D. The marks on the breadboard have disappeared.

5. In the author’s mind ,her mother is_________.

A. strange in behavior.             B. keen on her research.

C. fond of collecting old things.      D. careless about her appearance.

 

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