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  3. As oil becomes increasingly difficult to find, the search for it is extended

As oil becomes increasingly difficult to find, the search for it is extended

游客2024-01-03  66
问题     As oil becomes increasingly difficult to find, the search for it is extended into more-hostile environments. The development of the oil field on the North Slope of Alaska and the construction of the Alaska pipeline are examples of the great expense and difficulty involved in new oil discoveries. Offshore drilling platforms extend the search for oil to the ocean’s continental shelves—those gently sloping submarine regions at the edges of the continents. More than one-quarter of the world’s oil and almost one-fifth of the world’s natural gas come from offshore, even though offshore drilling is six to seven times more expensive than drilling on land. A significant part of this oil and gas comes from under the North Sea between Great Britain and Norway. [br] The word "sloping" in the passage is closest in meaning to
选项 A、shifting
B、inclining
C、forming
D、rolling
答案 B
解析
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