单项选择题

A．Writing.
B．Science.
C．English.
D．Mathematics.
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单项选择题
A．People will accumulate less money to support themselves.B．People will be deprived of a couple of productive years.C．People will discover the life is plain and boring after retirement.D．People will not get all of the pensions.
A．People will accumulate less money to support themselves.
B．People will be deprived of a couple of productive years.
C．People will discover the life is plain and boring after retirement.
D．People will not get all of the pensions.
单项选择题
A．The number of sun flares.B．The sunspot cycle.C．The heat of the sun.D．The weather.
A．The number of sun flares.
B．The sunspot cycle.
C．The heat of the sun.
D．The weather.
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