单项选择题

In the last paragraph, the word" one" could best be replaced by ______.

A．the composer
B．an instrument
C．a family
D．the listener
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单项选择题
It can be inferred from the passage that______.
A．a stepladder used to have four legs
B．it is dangerous to use tools
C．a tripod is safer in a tool design
D．workers are safer on production lines
单项选择题
From the passage we know that joints and muscles perform best when______.
A．they are twisted and stretched
B．they are in their normal position
C．they are tested with a human" guinea pig"
D．they are tested with electronic instruments
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