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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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 this passage, good writing is compared to free food because __________.
A．both writers and cooks have to work long hours every day
B．both are essential to life
C．both writers and cooks can earn a good living
D．both are enjoyable
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