A-A+
The corona rays become weak and invisible when
问题详情
The corona rays become weak and invisible when they reach the Earth, because the Earth is far away from the Sun.
A．Right
B．Wrong
C．Not mentioned请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：C
解析：文中提到“Theraysofgasthinoutastheyreachthespacearoundtheplanets，但没有提及是否因为距离远的缘故。
