单项选择题

Stressful environment leads to unhealthy behaviors such as poor eating habits, which ______ increase the risk of high blood pressure and heart disease.

A. in turn
B. by chance
C. by fortune
D. in case
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After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.
A. runs away
B. charges for
C. falls off
D. merges into
单项选择题
He couldn’t ______ his curiosity to see what was in the box.
A. retain
B. restrain
C. restrict
D. represent
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