单选题
Why was Kohoutek referred to as" the comet of the century"?
A、
It was thought to be extremely old.
B、
It passes the Earth once a century.
C、
Scientists predicted it would be very bright.
D、
Scientists have been tracking it for a century.
【正确答案】
B
【答案解析】
[解析]世纪慧星指慧星一个世纪才经过地球一回。故应选B。
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