单项选择题

Stressful environments lead to unhealthy 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
Eye contact is important because wrong contact may create a communication ________.
A．tragedy
B．vacuum
C．question
D．barrier
单项选择题
The ________ stuck on the envelope says By Air .
A．diagram
B．label
C．signal
D．mark
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