单项选择题
The U.S. dollar is traditionally the ______ of choice all over the world in case of crisis.
A．money
B．currency
C．bill
D．cash
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单项选择题
Customer service stands out as the area where WestNet falls most behind, with 43.8 percent of its users in the survey saying its security does not come______ .
A．up to scratch
B．up in the air
C．up to date
D．up to the minute
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