单项选择题

What is the disadvantage of fining people for making noise during trips（）

A. There would be fewer travelers.
B. It costs much to enforce.
C. It would trigger more social conflicts.
D. It wasn’t mentioned in the passage.

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单项选择题
The E.C.B. was acting in cooperation with all the following banks except（）

A. the Federal Bank of America.
B. the Bank of Japan.
C. the Swiss National Bank.
D. the Bank of Germany.
单项选择题
How many years did Skype start helping people make calls over the internet for free（）

A. Eight years.
B. Four years.
C. Three years.
D. Six years.
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