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叶起源于什么?它具有哪些功能?

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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

This is a _______ moment for our research. We should be careful.

A. critical
B. belt
C. conscience
D. copper