单项选择题

Weight lifting, or any other sport that builds up your muscles, can make bones become denser and less （） to injury.

A．attached
B．prone
C．immune
D．reconciled

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单项选择题
Around 80 percent of the （） characteristics of most white Britons have been passed down from a few thousand Ice Age hunters.

A．intelligible
B．random
C．spontaneous
D．genetic
单项选择题
Optimism is a （） shown to be associated with good physical health, less depression and longer life.

A．trail
B．trait
C．trace
D．track
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