单项选择题

The point at which a muscle is attached to the bone that movies is called the______.

A．source
B．insertion
C．tendon
D．diaphragm
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单项选择题
The passage implies that reversing the muscle-bone movement used to bend an arm requires______.
A．the relaxation of two sets of muscles
B．the use of different muscles
C．a different kind of tissue
D．the enlargement of the muscle
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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