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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

单项选择题In the last paragraph, the word seriously is closest in meaning to ______.

A．importantly
B．honestly
C．solemnly
D．formally