单项选择题

After a child grows up, he ______ ．

A．will have little time playing
B．has to be successful in finding a job
C．can still ask for help in time of trouble
D．should be able to take care of himself

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单项选择题

The main idea of the passage is that ______ ．

A．life is not enjoyable since, each age has some pains
B．young men can have the greatest happiness if they work hard
C．childhood is the most enjoyable time in one's life
D．one is the happiest if he can make good use of each age in his life

单项选择题

Which of the following is not true of the sun spots

A．They are caused by the magnetic pull from inside the sun.
B．They are areas of high- level magnetism.
C．They are actually black holes in the sun.
D．They reach their peak in a cycle of 11 years.