Question

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

 

Answer 1

【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。