单选题
Were it not for the new telescope high in the Andes Mountains, researchers would not have argued that ______.
A、
Sagittarius A is a powerful emitter of radio waves
B、
a super-massive black hole contains as much as a million suns
C、
Sagittarius A is a super-massive black hole
D、
Sagittarius A lies just at the center of the Milky Way Galaxy
【正确答案】
C
【答案解析】
文章第四段最后一句指出“Sagittarius A is a single，small object rather than a cluster of starts”，由此可知[C]为正确答案。
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