The temperature at the center of the Sun is much higher than it is at the surface. Gases are main part in the corona rays.

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问题 The temperature at the center of the Sun is much higher than it is at the surface.
Gases are main part in the corona rays.

选项 A、Right
B、Wrong
C、Not mentioned

答案A

解析 见文中“The corona rays are made up of gases”。
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