单项选择题

Optimism is a ______ shown to be associated with good physical health, less depression and longer life.

A．trace
B．trail
C．trait
D．track
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单项选择题
The ______ majority of citizen tend to believe the death penalty will help decrease the crime rate.
A．overwhelming
B．overflowing
C．premium
D．prevalent
单项选择题
Researchers have discovered that ______ with animals in an active way may lower a person’s blood pressure.
A．merging
B．migrating
C．interacting
D．integrating
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