单项选择题

A．It is harmful to the body and mind.
B．It is good to personal relationships.
C．It is harmful to the family happiness.
D．It is a good change after idling for a long time.
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填空题
According to the passage, a worker primarily works for ______.
单项选择题
A．One improves muscular action consciously.B．One performs simple actions without working.C．One always knows what his muscles are doing.D．One’s muscles are used only to the extent necessary for each action they perform.
A．One improves muscular action consciously.
B．One performs simple actions without working.
C．One always knows what his muscles are doing.
D．One’s muscles are used only to the extent necessary for each action they perform.
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