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

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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

单项选择题

Which is the main idea of this passage（）

A．Dark-colored clothes are warmer in the sunlight.
B．Objects absorb part of the sunlight.
C．Color is caused by reflected light rays.
D．A red object reflects mostly red light.