单项选择题


Questions 14 to 16 are based on a talk on the world’s air pollution. You now have 15 seconds to read Questions 14 to 16.
What do Thomas Karl and Kevin Trenberth believe as to air pollution

A．Climate change could be caused by mostly natural forces.
B．Today greenhouse gases are the largest human influence on global climate.
C．Climate change is truly a global issue, but it can’t prove to be the greatest challenge to us.
D．Carbon dioxide levels in the atmosphere have fallen by 31 percent since preindustrial times.
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单项选择题
What does common sense (Para. 3, first sentence) refer to
A．If a marriage is unhappy, if you get a divorce, it is likely you will be happier than you stayed married.
B．Divorce doesn’t necessarily make adults happy.
C．You can increase a sense of mastery after divorce compared with those who stayed married.
D．More people who stay married feel happier than those who get divorced.
单项选择题
What’s the reason for costlier college education
A．Inadequate State budget.
B．Rising tuitions.
C．Rise in parents’ income.
D．Increasing state-funded student aid.
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