单项选择题

Cigarette smoking is a great health ______ and may lead to fatal diseases.

A．opposition
B．protagonist
C．fault
D．hazard
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单项选择题
After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.
A．runs away
B．charges for
C．falls off
D．merges into
单项选择题
Stressful environment leads to unhealthy behaviors such as poor eating habits, which ______ increase the risk of high blood pressure and heart disease.
A．in mm
B．by chance
C．by fortune
D．in case
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