What does the second paragraph mainly discuss? Which of the following characteristics of radio galaxies is mentioned in the pas

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问题 What does the second paragraph mainly discuss?
Which of the following characteristics of radio galaxies is mentioned in the passage?

选项 A、They are a type of elliptical galaxy.
B、They are usually too small to be seen with a telescope.
C、They are closely related to irregular galaxies.
D、They are not as bright as spiral galaxies.

答案A

解析
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