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  3. Careful observations and systematic studies of sunspots The leading spot and the following spot are the names of

Careful observations and systematic studies of sunspots The leading spot and the following spot are the names of

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问题 Careful observations and systematic studies of sunspots
The leading spot and the following spot are the names of
选项 A、two large sunspots.
B、a large spot and a small spot.
C、the two spots in a spot pair.
D、the central core and the ring around if.
答案C
解析 文章第三段的前两句提到，太阳黑子总是被观测到成对出现。成对出现的两黑子被区分为主导地位的黑子和从属地位的黑子。所以答案为C，主导与从属地位的黑于是用来区分成对出现的黑子的。
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