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 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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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
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
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