单项选择题

If a consumer wants a quick settlement of his problem, it's better to complain to （）

A．a shop assistant
B．a store manager
C．the manufacturer
D．a public organization

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单项选择题
If someone works around the clock, it means（）

A．he likes his job
B．he works non-stop
C．he is very punctual
D．he repairs clocks and watches
单项选择题
The author is （） about the future development of robots.

A．worded
B．pessimistic
C．optimistic
D．indifferent
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