单项选择题

Why are some muscles attached to bones at an angle

A．To cause the muscles to push.
B．To strengthen the muscles.
C．To shorten tissues.
D．To perform a turning action.
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单项选择题
According to the passage, movement occurs when a muscle______.
A．grows
B．shortens
C．relaxes
D．pushed
单项选择题
One possible reason why women have better memories than men is that______.
A．they have a wider range of interests
B．they are more reliant on the environment
C．they have an usual power of focusing their attention
D．they are more interested in what's happening around them
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