单项选择题

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

A．is able to design new tools
B．measures the amount of energy used
C．enable people to see the muscular movements
D．visualizes electrical signals
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单项选择题
Dr. Tichauer started his experiments initially to __________.
A．improve efficiency
B．increase production
C．reduce work load
D．improve comfort
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 positions
C．they are tested with a human "guinea pig"
D．they are tested with electronic instruments
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