单项选择题

In aerospace devices the weight of the necessary power producing equipment is_____ .

A．vital
B．possible
C．capable
D．reliable
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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
单项选择题
It is not profitable to provide bus services in districts where the population is widely______.
A．scattered
B．dismissed
C．separated
D．spread
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