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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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
单项选择题
In ancient times, some catastrophic extinction of species occurred ______.
A．sequentially
B．repeatedly
C．naturally
D．intentionally
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