题目内容

禾本科植物叶片的上表皮有运动细胞,由于它的存在,当天气干旱时,叶片会发生卷曲成筒状。

A. 对
B. 错

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更多问题

叶起源于什么?它具有哪些功能?

禾本科植物的分蘖在生产上有什么意义?

If you're still ________________ about this treatment, you can put your trust in us and give it a try.

A. coincidence
B. infect
C. contrive
D. skeptical

Praise must be used widely to ______________ students who perform up to expectations and to encourage students to perform to maximum levels.

A. complement
B. compliment
C. cherish
D. protray

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