题目内容

以下那些物质适合液相色谱分析？

A. 氨基酸、核酸
B. 多肽、蛋白质
C. 大分子药物

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John was so sleepy he could not keep his eyes ____.

A. open
B. opened
C. to open
D. opening

When he was told the truth, he got ____ with me.

A. angry
B. angrily
C. anger
D. excitedly

It’s not ____ whether he’ll return the book to me soon.

A. certain
B. certainly
C. sure
D. surely

如有如下说明：inta[10]={0,1,2,3,4,5,6,7,8,9};则赋值不为9的表达式是__________。

A. a[10-1]
B. a[8]
C. a[9]-0
D. a[9]-a[0]