The number of red-crowned cranes is getting ________.

A. small and small
B. little and little
C. smaller and smaller
D. less and less
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科目：初中英語 來源：江蘇省期末題 題型：單選題

The number of red-crowned cranes is getting ________.
[     ]
A. small and small
B. little and little
C. smaller and smaller
D. less and less

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