单项选择题

Most of the 33 newly discovered planets" giant gas bags swing so erratically that they create havoc on any smaller, nearby, life-friendly planets.

A．destruction
B．benefits
C．chaos
D．violence
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单项选择题
Moderate and regular exercise can boostthe rate of blood circulation and metabolism.
A．restrict
B．reduce
C．increase
D．stabilize
单项选择题
In spite of the taxingbusiness schedule, he managed to take some time off for exercise.
A．imposing
B．demanding
C．compulsory
D．temporary
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