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The number of red-crowned cranes is getting ___________.
A．small and smallB．little and little
C．smaller and smallerD．less and less
C
考查比較級(jí)的用法。句意“丹頂鶴的數(shù)量正在變得越來(lái)越少�！薄氨容^級(jí)+and+比較級(jí)”表示“越來(lái)越......”。less修飾不可數(shù)名詞。small和big用來(lái)指數(shù)量的多少。故選C。
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