Official 38 Lec 4
Question 1 of 6
What is the main purpose of the lecture?

A.

To describe two new theories about the formation of rocky planets

B.

To discuss competing theories about the formation of gas planets

C.

To compare the composition of Jupiter, Saturn, Uranus, and Neptune

D.

To explain why young stars are often surrounded by disks of gas and dust

正确答案:B

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