Careful observations and systematic studies of sunspots In the last paragraph the word "persistent" means

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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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