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Careful observations and systematic studies of sunspots If an intense sunspot activity had occurred in 1857, the next one would
Careful observations and systematic studies of sunspots If an intense sunspot activity had occurred in 1857, the next one would
admin
2009-05-21
46
问题
Careful observations and systematic studies of sunspots
If an intense sunspot activity had occurred in 1857, the next one would have been in
选项
A、1858.
B、1862.
C、1865.
D、1868.
答案
D
解析
答案在本文第四段的第三句话。太阳黑子的剧烈活动每十一年爆发一次,因此如果上一次发生在1857年,那么下一次就会发生在1868年。
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职称英语理工类B级题库职称英语分类
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