单项选择题

Stressful environments lead to unhealthy behaviors such as poor eating habits, which ______ increase the risk of heart disease.

A．in turn
B．in return
C．by chance
D．by turns
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单项选择题
John boasted that he could finish the job all by himself in no time.
A．very rapidly
B．on time
C．in time
D．at any moment
单项选择题
My colleagues and I were greatly puzzled by our repeated failures in the experiment.
A．distressed
B．discontented
C．annoyed
D．perplexed
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