46. Which of the following characteristics of radio galaxies is mentioned in the passage?
(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.

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統計： A(8), B(0), C(1), D(1), E(0) #803184