—Forestsareveryimportanttous，aren'tthey?—Yes，theycanpre...

問題詳情：

—Forests are very important to us，aren't they?

—Yes，they can prevent ________ from washing the earth away.

A. water  B. trees  C. grass

【回答】

A 

知識點：名詞

題型：選擇題