Official 50 Lec 4
答题结果:0/6
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Question 1 of 6
What is the lecture mainly about?

A.

Efforts to increase the production of petroleum and natural gas

B.

Problems associated with the refining of dead oil

C.

Recent improvements in methods used to locate petroleum

D.

Background information essential to understanding the petroleum industry

我的答案:

正确答案:D

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