The number of the red-crowned cranes will become ____ if we don’t take any action.
A．fewer and fewerB．less and lessC．smaller and smallerD．larger and larger
C
形容詞的比較級(jí)用and來連接表示越來越怎樣，根據(jù)語境可知丹頂鶴的數(shù)量會(huì)越來越少，如果人類不采取措施的話。
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