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As we all know, the number of Tibetan antelopes(藏羚羊) ________ becoming ___________.
A．is; less and lessB．are; less and less
C．is; smaller and smallerD．are; smaller and smaller
C

試題分析：句意：我們都知道，藏羚羊的數(shù)量越來越少。數(shù)量the number of的be動詞用is;數(shù)量的少用small。所以選C。
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