单项选择题

Which of the following is not an answer to the problem of noise pollution（）

A. Having signs to remind people of keeping quiet.
B. Using signal-jamming technology to prevent phone calls.
C. Putting a price on noise.
D. Enacting strict rules by the government.

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单项选择题
If those banks couldn’t borrow dollars, what might happen（）

A. Their loans to American companies would be forced cut off.
B. They would sell dollar-denominated assets.
C. They would force money down in already unstable markets.
D. All of the above would happen.
单项选择题
How many Skype are used around the world each year（）

A. 170 million.
B. 170 billion.
C. 204 billion.
D. 204 million.
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