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单项选择题
A．Eating more fresh vegetables and fruits.B．Taking pills of vitamins and trace elements.C．Alternating work with rest.D．Doing regular exercise.
A．Eating more fresh vegetables and fruits.
B．Taking pills of vitamins and trace elements.
C．Alternating work with rest.
D．Doing regular exercise.
单项选择题
A．The earth will get even cooler.B．No species will survive in fifty years.C．30% of all life forms will become extinct by 2050.D．No sun’s heat can reach the earth at all.
A．The earth will get even cooler.
B．No species will survive in fifty years.
C．30% of all life forms will become extinct by 2050.
D．No sun’s heat can reach the earth at all.
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