The second paragraph is mainly concerned with ____________. All the following are parts of the sun’s atmosphere except ________

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问题 The second paragraph is mainly concerned with ____________.
All the following are parts of the sun’s atmosphere except ____________.

选项 A、the corona
B、the chromosphere
C、the photosphere
D、the core

答案D

解析 从文章第二段可以知道A、B、C项都是大气的组成部分。故本题答案为D。
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