加强湿地保护对东北的防洪和生态环境改善具有重要意义。[ ]_爱下问搜题

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问题判断题

加强湿地保护对东北的防洪和生态环境改善具有重要意义。[ ]

答案

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单项选择题

在粗放养水库中，冬季水位应保持（）

A.较高

B.较低

C.最低

D.适中

单项选择题

I'm tired out. I ______ all afternoon and I don't seem to have finished anything.

A. shopped

B. have shopped
C. had shopped

D. have been shopping