Official 40 Lec 3
Question 4 of 6
Why does the professor mention mining?

A.

To explain why the price of fossil fuels is continually rising

B.

To explain how certain fuel sources can be recovered from the ocean floor

C.

To explain why coal and oil are more difficult to obtain than natural gas

D.

To explain why fossil fuels contribute to an excess of carbon in the atmosphere

正确答案:D

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