单项选择题

Many people came to donate blood of their own accord .

A．willingly
B．for their own sake
C．of their own
D．without the help of others
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单项选择题
Most of the 33 newly discovered planets giant gas bags swing so erratically that they create havocon any smaller, nearby, life-friendly planets.
A．destruction
B．benefits
C．chaos
D．violence
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
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