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
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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.
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单项选择题
According to the passage, it is believed that the sun ______ ．
A．moves in a quick but steady way year after year
B．sends out less and less heat and light with each passing year
C．radiates the same amount of light every year
D．might have a strong influence on the weather patterns
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