单选题：What are the estimates of the world's oil and gas reserves?

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题目内容：

What are the estimates of the world's oil and gas reserves? A．4,000 billion barrels by the average forecast.
B．8,000 billion barrels estimated by the Swedes.
C．3,500 barrels envisaged by IPCC.
D．3,500 billion by a growing number of scientists.

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