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