. He tried to be ______, but his trembli_爱下问搜题

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问题选择题

.

He tried to be ______, but his trembling hands gave him away.

A．calm

B．still

C．silent

D．quiet

答案

答案：A

单项选择题

The ancient Greeks were much interested in speculating on the nature of the world about them.

A．specializing in

B．experimenting on

C．calculating on

D．pondering over

单项选择题

革兰阴性菌的细胞壁肽聚糖缺少的成分是（）。

A.聚糖骨架

B.β-1，4糖苷键

C.四肽侧链

D.五肽交联桥

E.N-乙酰葡糖胺和N-乙酰胞壁酸