单项选择题

A．How to hold back one’s tears.
B．Adults should be free of crying.
C．Why people cry
D．Crying is of great benefit to our health.
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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.
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.
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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