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
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单项选择题
The latest year for which figures could be obtained is __________.
A．the year the author wrote the article
B．1977
C．any year between 1977 and 1983
D．1983
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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