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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单项选择题
The underlined phrase the instinctive American wariness of Washington (Para. 2) implies ______.
A．Americans' deep distrust for the U.S. government
B．Americans' very keen concern about their nation
C．Americans' rising interest in political affairs
D．Americans' dislike of polities
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
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