Thenumberofthered-crownedcraneswillbecome

問題詳情：

 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

知識點：形容詞比較級

題型：選擇題