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
According to the author, if your letter is thrown into some letters-to-be-read file,
A．it will receiver immediate attention
B．it will be dealt with by the secretary
C．it is likely to be neglected
D．it is meant to be delivered soon
单项选择题
According to the passage, some managers don't have to do any letter writing because __________.
A．they rely on quick notes
B．they have excellent secretaries
C．they have a computer to do it
D．they prefer making phone calls
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