2. 外语
  3. Careful observations and systematic studies of sunspots Sunspots are cooler than the rest of the sun’s surface because

Careful observations and systematic studies of sunspots Sunspots are cooler than the rest of the sun’s surface because

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问题 Careful observations and systematic studies of sunspots
Sunspots are cooler than the rest of the sun’s surface because
选项 A、they produce less energy.
B、they are buried in the sun.
C、they are far away from magnetic fields.
D、they are close to magnetic fields.
答案A
解析 在第二段里这个问题讲得十分具体，这段的最后两句提到，由于黑子发出的光和热相对较少，它们颜色更暗，也比太阳表面的其他部分凉爽。所以A是正确答案。
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