When I try to understand __________that prevents so many Americans from being as happy as one might expect, it seems that there are two causes.

     A. why it does        B. what it does          C. what it is       D. why it is

 

【答案】

C

【解析】

 

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Children start out as natural scientists, eager to look into the world around them．Helping them enjoy science can be easy; there’s no need for a lot of scientific terms or expensive lab equipment．You only have to share your children’s curiosity．Firstly, listen to their questions．I once visited a classroom of seven－year－olds to talk about science as a job．The children asked me “textbook questions” about schooling, salary and whether I liked my job．When I finished answering, we sat facing one another in silence．Finally I said, “Now that we’re finished with your lists, do you have questions of your own about science?”

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