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Mar Levine, ____ scientist at University of Pennsylvania, US, has found that competitive eaters have stomachs that can expand like ____ balloon.

A.a; a

B.a; the

C.a; /

D.the; a

 

【答案】

A

【解析】考查冠词。第一空表示泛指一位宾夕法尼亚大学的一位科学家;第二空仍然表示泛指气球。

 

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