单项选择题

Doctors are interested in using lasers as a surgical tool in operations on people who are______to heart attack.

A. prone
B. disposed
C. infectious
D. accessible
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单项选择题
The students must hand in their essays in a week,______ No, they______
A. needn't they...mustn't

B. mustn't they...mustn't
C. mustn't they...needn't

D. shouldn't they...should
单项选择题
In the experiment we kept a watchful eye______the developments and recorded every detail.
A. in
B. at
C. for
D. on
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