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.
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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.
单项选择题
A．Beginner.B．Lower intermediate.C．Upper intermediate.D．Advanced.
A．Beginner.
B．Lower intermediate.
C．Upper intermediate.
D．Advanced.
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