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 it.

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子是用来区分成对出现的黑子的。

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职称英语理工类C级

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