单项选择题

According to the selection, the muscular sense is responsible for（）

A．the efficiency of our muscles
B．the normal breathing function
C．directing our muscles intelligently
D．the work of only our involuntary muscles

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单项选择题
Under a microscope , muscle cells appear to be （）

A．textured like wood
B．colored like wood
C．smooth and red
D．short and thick
单项选择题
According to the selection more than half of a person's body is composed of （）

A．voluntary muscles
B．involuntary muscles
C．muscle fibers
D．sensory nerves
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