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
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
单项选择题
What are involved in the design of a new tool according to the passage
A．Electronic instruments and a regular tool.
B．A human "guinea pig" and a regular tool.
C．Electronic instruments and a human "guinea pig".
D．Electronic instruments, a human "guinea pig" and a regular tool.
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