单项选择题

The drugs are thought to slow or prevent fatty () in the arteries.

A. buildup
B. outbreak
C. make-up
D. passers-by

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Little rain and higher temperature have () the shortage of water in these poor areas.

A. eased
B. worsened
C. excluded
D. improved
单项选择题
Thanks to effective security measures, heart operations are () as dangerous as before.

A. even more
B. to date
C. no longer
D. once again
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