Official 26 Lec 2
答题结果:0/6
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Question 1 of 6
What is the lecture mainly about?

A.

The discovery of a previously unknown trace metal

B.

The role trace metals play in carbon cycling

C.

Ways that living organisms rid themselves of trace metals

D.

Ways that zinc interacts with carbon dioxide

我的答案:

正确答案:B

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