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.
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单项选择题
A．A disastrous car accident happened on the street.B．Nobody was injured in that car accident.C．Several people were killed in the car accident.D．The driver himself got killed in the car accident.
A．A disastrous car accident happened on the street.
B．Nobody was injured in that car accident.
C．Several people were killed in the car accident.
D．The driver himself got killed in the car accident.
单项选择题
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.
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