单项选择题

Questions 7 and 8 are based on the following news. From the drug trade, Mexican gangs gained ______ from the US each year.

A．$1.4 billion
B．$38 billion
C．$17 billion
D．$40 billion
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单项选择题
Question 6 is based on the following news.
A．The carbon tax does not exist in Europe.
B．French government backs down on carbon tax plan.
C．The court rejected the carbon tax plan last year.
D．The president is revising the carbon tax plan.
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