单项选择题

According to the theory of evolution, all living species are modified ______ of earlier species.

A．descendants
B．defendants
C．developments
D．dependants
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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
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
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