单项选择题

According to this passage, more than haft of a person's body is composed of ______.

A．involuntary muscles
B．muscle fibers
C．voluntary muscles
D．sensory nerves
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单项选择题
An average woman is weaker than an average man because she has ______.
A．the muscular sense more important than any other sense
B．less muscle than men for her body mass
C．60 to 70 percent less muscle for her body mass
D．less muscle fiber for her body weight
单项选择题
It is implied but not stated that ______.
A．the muscular sense is more important than any other sense
B．muscular sense involves automatic perception
C．there are many more than 500 involuntary muscles in the body
D．muscle tissue is inflexible
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