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
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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
单项选择题
In a barter economy, finding somebody who wanted to trade his old car ______ a sailboat might not always be an easy task.
A．in terms of
B．by auction for
C．by way of
D．in exchange for
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