单项选择题

A．A state of being sick, but not very serious.
B．A state of being healthy, but not very strong.
C．A state between health and disease.
D．A state of being recovered from stress.
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单项选择题
A．3 and 7.B．7 and 9.C．3 and 9.D．3 and 13.
A．3 and 7.
B．7 and 9.
C．3 and 9.
D．3 and 13.
单项选择题
A．They pollute the atmospheric environment.B．They produce dangerous gases.C．They stop the sun’s heat reaching the earth.D．They cause global warming.
A．They pollute the atmospheric environment.
B．They produce dangerous gases.
C．They stop the sun’s heat reaching the earth.
D．They cause global warming.
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