Official 54 Lec 2
Question 6 of 6
Listen again to part of the Lecture. Then answer the question. Why does the professor say this:

A.

To find out what the students know about Mars

B.

To question certain geological studies of other planets

C.

To express a reservation he has about the hypothesis

D.

To indicate that he is going to change the topic

正确答案:C

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