单项选择题

It can be inferred from the passage that all the work on the assembly line was （）

A．dangerous and dull
B．harmful but beneficial
C．repetitive and dull
D．easy but tiring

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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

Humans and robots worked together in many areas of work because （）

A．robots never complain about the tiring work
B．the management can pay little and benefit a lot
C．it is dangerous for humans to do some harmful work
D．they have their own weaknesses and advantages