单项选择题

"Xers” is repeated several times to refer to ______.

A．accusers
B．young respondents
C．college students
D．blue-collar workers
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单项选择题
The survey has revealed that in the past 40 years the public faith in the American government has dropped by ______.
A．67 percent
B．51 percent
C．35 percent
D．16 percent
单项选择题
Sagittarius A is ______.
A．clearly a super-massive black hole
B．a compact cluster of normal stars
C．a single, small subject
D．still an issue of controversy
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