Official 26 Lec 3
答题结果:0/6
答题时间:0''
Question 1 of 6
What is the lecture mainly about?

A.

The orbits of comets

B.

Unique characteristics of a famous comet

C.

The structure of comets

D.

The origin and life cycle of comets

我的答案:

正确答案:A

00:00
00:00
隐藏原文

译文