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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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
单项选择题
The purpose of the author in writing this passage is __________.
A．to explain and persuade
B．to comment and criticize
C．to interest and entertain
D．to argue and demonstrate
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