单项选择题

A" myograph" (Para. 2, Line 1) is an electronic instrument that______.

A．is able to design new tools
B．measure the amount of energy used
C．enables people to see the muscular movements
D．visualizes electrical signals
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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
In the past, American families tended to be______.
A．quite small
B．medium sized
C．quite large
D．small
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