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
It is not profitable to provide bus services in districts where the population is widely______.
A．scattered
B．dismissed
C．separated
D．spread
单项选择题
When products made in factories______, they are thrown away as garbage.
A．come to an end
B．are put to use
C．are used up
D．wear out
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