Official 19 Lec 2
Question 6 of 6
What does the professor mean when he says this:

A.

He wants to emphasize the progress that has been made in radio astronomy

B.

He thinks radio astronomy and optical astronomy both provide valuable information

C.

He does not want to spend time discussing the technology of radio telescopes

D.

He would like the students to give examples of discoveries made with radio telescopes

正确答案:C

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