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问题 选择题

I like Mrs Li's  lessons because they're          .     [ ]

A. live      

B. lovely    

C. lively      

D. living

答案

答案：C

选择题

用显微镜观察标本之前，首先要对光，判断光是否对准的依据是从目镜内应看到（　　）的视野．

A．白亮

B．灰暗

C．黑色

D．半明半暗
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选择题

I should apologize to you for failing to visit you last week, but I've been very busy_____ the past few months.

A．since

B．before

C．among

D．over
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