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  3. World Crude Oil Production May Peak a Decade Earlier Than Some Predict? In a finding that may speed efforts to conserve oil,

World Crude Oil Production May Peak a Decade Earlier Than Some Predict? In a finding that may speed efforts to conserve oil,

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问题         World Crude Oil Production May Peak a Decade Earlier Than Some Predict?
    In a finding that may speed efforts to conserve oil, scientists in Kuwait predict that world conventional crude oil production will peak in 2014. This prediction is almost a decade earlier than some other predictions. Their study is in ACS’ Energy & Fuels.
    Ibrahim Nashawi and colleagues point out that rapid growth in global oil consumption has sparked a growing interest in predicting "peak oil". "Peak oil" is the point where oil production reaches a maximum and then declines. Scientists have developed several models to forecast this point, and some put the date at 2020 or later. One of the most famous forecast models is called the Hubbert model. It assumes that global oil production will follow a bell shaped curve. A related concept is that of "Peak Oil". The term "Peak Oil" indicates the moment in which worldwide production will peak, afterwards to start on irreversible decline.
    The Hubbert model accurately predicted that oil production would peak in the United States in 1970. The model has since gained in popularity and has been used to forecast oil production worldwide.
    However, recent studies show that the model is insufficient to account for more complex oil production cycles of some countries. Those cycles can be heavily influenced by technology changes, politics, and other factors, the scientists say.
    The new study describes development of a new version of the Hubbert model that provides a more realistic and accurate oil production forecast. Using the new model, the scientists evaluated the oil production trends of 47 major oil-producing countries, which supply most of the world’s conventional crude oil. They estimated that worldwide conventional crude oil production will peak in 2014, years earlier than anticipated. The scientists also showed that the world’s oil reserves are being reduced at a rate of 2. 1 percent a year. The new model could help inform energy-related decisions and public policy debate, they suggest.
The term "a bell shaped curve" appearing in Paragraph 2 indicates that global oil production will______..
选项 A、take the shape of a flat curve
B、keep growing
C、keep declining
D、start to decline after global oil production peaks
答案D
解析 推理题。答案参见接下来的句子，即世界石油生产达到最大峰值后将下降。
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