单项选择题

The authority claims that the new pills can dramatically increase life expectancy, but there's no evidence to support this.

A．empirical
B．actual
C．concrete
D．imperial
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单项选择题
During times of war or economic ______ many people convert their wealth into precious stones, which are transportable and more easily sold.
A．distraction
B．disturbance
C．tremor
D．vibration
单项选择题
However, as the evidence began to ______ experts from the Zoo felt obliged to investigate.
A．accumulate
B．amass
C．assemble
D．congregate
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