Mar Levine, ____ scientist at University of Pennsylvania, US, has found that competitive eaters have stomachs that can expand like ____ balloon.
A．a(chǎn); aB．a(chǎn); theC．a(chǎn); /D．the; a
A
本題考查冠詞。第一空a scientist at University of Pennsylvania表示泛指一位賓夕法尼亞大學(xué)的一位科學(xué)家；第二空a balloon仍然表示泛指氣球。句意：Mar Levine，一位美國賓夕法尼亞大學(xué)的一位科學(xué)家，已經(jīng)發(fā)現(xiàn)勝過他人的食客有能夠像氣球膨脹的胃。
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