From this passage, we can infer that the author
A. holds that it is impossible to predict an earthquake.
B. is very surprised about this discovery.
C. thinks that scientists could do better.
D. thinks this discovery is very important for earthquake prediction.
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During the inspection, the starting air valves should be closed () the engine from running
A. to increase
B. to prevent
C. to reduce
现代意义上的电子商务产生于1995年，标致性的事件是美国亚马逊网上书店的诞生。（）
Why can girls benefit from working mothers？
A. Because they tend to take their mothers as life models.
Because they are psychologically closer to their mothers.
C. Because working mothers like to communicate more with girls.
D. Because they are always trained by their working mother.
According to the author, "peak oil" means
A. the highest point of oil demand.
B. the top supply of crude oil.
C. the largest consumption of oil.
D. the longest period oil reserve could last.
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