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
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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
单项选择题
Intelligent use of the muscles means that ______.
A．one always knows what his muscles are doing
B．one performs simple actions without working
C．one's muscles are used only to the extent necessary for each action they perform
D．one improves muscular action consciously
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