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A．Sub-health is a very dangerous state.B．A balanced diet and exercise are essential to keep away from sub-health.C．Most sub-healthy people are middle-aged or elderly.D．People should eat big meals to get more nutritional elements.
A．Sub-health is a very dangerous state.
B．A balanced diet and exercise are essential to keep away from sub-health.
C．Most sub-healthy people are middle-aged or elderly.
D．People should eat big meals to get more nutritional elements.
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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