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Careful observations and systematic studies of sunspots In the last paragraph the word "persistent" means
Careful observations and systematic studies of sunspots In the last paragraph the word "persistent" means
admin
2009-05-21
60
问题
Careful observations and systematic studies of sunspots
In the last paragraph the word "persistent" means
选项
A、important.
B、effective.
C、enduring.
D、visible.
答案
C
解析
答案在本文最后一段。黑子群的存在时间平均为25天,最持久稳定的大的黑子群能存在两至三个月。将两句话当中的时间加以对比,可以推断persistent的意思是指更为长久的,所以答案为C。
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本试题收录于:
职称英语理工类B级题库职称英语分类
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职称英语理工类B级
职称英语
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