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
We love peace, yet we are not the kind of people to yield ______ any military threat.
A．up
B．to
C．in
D．at
单项选择题
This album is ______ as it was the only one ever signed by the President.
A．unusual
B．unique
C．rate
D．special
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