单项选择题

A．They help people save time on housework.
B．They go into the garbage heap.
C．They are harmful to the environment.
D．They make products more expensive.
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单项选择题
A．Man’s emotions is affected by dreams and sleep.B．A sound sleep usually brings about a good mood.C．Scientists began to do researches on dreams 20 years ago.D．What happens in a dream is less significant than who appears.
A．Man’s emotions is affected by dreams and sleep.
B．A sound sleep usually brings about a good mood.
C．Scientists began to do researches on dreams 20 years ago.
D．What happens in a dream is less significant than who appears.
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