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
We have to try every means to ______ the costs of the project.
A. bring off
B. bring up
C. bring down
D. bring back
单项选择题
The writer was much kinder to her youngest son than she was to the others ______ of course, made the others jealous.
A. who
B. that
C. what
D. which
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