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问题 单项选择题

细菌细胞膜的功能，例外的是

A．参与物质交换
B．参与生物合成
C．参与呼吸过程
D．形成中介体
E．决定遗传性状

答案

参考答案：E

选择题

It’s cold in here. We must have the fire　　　　day and night.

A．burn

B．burns

C．burnt

D．burning
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选择题
I _____ in London for many years, but I've never regretted my final decision to move back to China.

A. lived
B. was living
C. have lived
D. had lived
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