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
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
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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