单项选择题

The walls of the tunnel are designed to ______ heat.

A．aggregate
B．dissipate
C．radiate
D．segregate
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单项选择题
The doctor warned him to ______ his workload if he wanted to maintain health.
A．ward off
B．put away
C．cut down
D．stand for
单项选择题
In the past, energy sources were thought to be ______, but it was not the case.
A．productive
B．transient
C．eternal
D．boundless
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