单项选择题

The phrase "called upon “in line 12 is closest in meaning to which of the following

A．Required.
B．Visited.
C．Permitted.
D．Subjected.
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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
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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