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
Fruit is rich ______ vitamins.
A．with
B．in
C．at
D．of
单项选择题
The story was said to have been based on the information from a reliable ________.
A．source
B．foundation
C．origin
D．basis
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