单项选择题

More and more people nowadays are exercising, quitting tobacco, losing weight and becoming more health-conscious.

A．given in
B．giving out
C．giving away
D．giving up
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单项选择题
It is impossible for parents to shield their children from every danger.
A．protect
B．relieve
C．conserve
D．free
单项选择题
Space is full of unseen hazards among which are cosmic rays.
A．dangers
B．ventures
C．galaxies
D．prospects
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