Thenumberofthered-crownedcraneswillbecome

问题详情：

 The number of the red-crowned cranes will become ________ if we don't take any actions to protect them.

    A. fewer and fewer  B. less and less    C. smaller and smaller  D. larger and larger

【回答】

C

知识点：形容词比较级

题型：选择题