The author refers to the ocean bottom as a "frontier" in the first sentence because it______. The Deep Sea Drilling Project was

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问题 The author refers to the ocean bottom as a "frontier" in the first sentence because it______.
The Deep Sea Drilling Project was significant because it was______.

选项 A、an attempt to find new sources of oil and gas
B、the first extensive exploration of the ocean bottom
C、composed of geologists from all over the world
D、funded entirely by the gas and oil industry

答案B

解析 参阅第前题题解。
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