Official 29 Lec 4
Question 1 of 6
What is the main purpose of the lecture?

A.

To help students understand what is required to launch a satellite

B.

To describe new materials now being used to explore space

C.

To describe a potential technology for space exploration

D.

To show how ideas from science fiction often develop into actual technologies

正确答案:C

显示答案
进入答题
00:00
00:00
隐藏原文

译文

精听文本