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单项选择题

Questions 15～18

A. Refined oil.
B. Mineral ores.
C. Coal gas.
D. Natural gas.
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单项选择题A. Because they had had a hard time finding a parking lot. B. Because the park was closed before they reached there. C. Because they had jammed into a crowded parking lot there. D. Because the park was crowded with too many people.

A. Because they had had a hard time finding a parking lot.
B. Because the park was closed before they reached there.
C. Because they had jammed into a crowded parking lot there.
D. Because the park was crowded with too many people.

单项选择题A. It is absolutely as unpredictable as it is destructive and violent. B. The more time that has passed since an earthquake, the bigger the chance one will strike. C. There is a 60-percent probability that an earthquake will occur in the United States. D. The overall history of earthquakes can help predict and prevent the oncoming earthquakes.

A. It is absolutely as unpredictable as it is destructive and violent.
B. The more time that has passed since an earthquake, the bigger the chance one will strike.
C. There is a 60-percent probability that an earthquake will occur in the United States.
D. The overall history of earthquakes can help predict and prevent the oncoming earthquakes.