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Questions 13 to 15 are based on the conversation you have just heard.

A. Before 10:00 am. B. Around noon.
B. C. At 4:00 pm. D. In the evening.

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Questions 9 to 12 are based on the conversation you have just heard.

A. Senator. B. Treasurer.
B. C. Secretary. D. President.

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Questions 19 to 22 are based on the passage you have just heard.

A. The great works of Hemingway and John Steinbeck.
B. World War I and literature.
C. A history of American literature.
D. The effects of World War I and the Great Depression on American literature.

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It is important to realize that the same technology that helps us may also harm us. We can prevent this from happening by carefully controlling the new technology. As one expert says," we must remember that it is the intelligent application of technology that will lead us to success. \

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设f(x)=ke-|x|(-∞＜x＜+∞)是一概率密度，则k=______．

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Questions 13 to 15 are based on the conversation you have just heard.

A. Before 10:00 am. B. Around noon. B. C. At 4:00 pm. D. In the evening.

Questions 9 to 12 are based on the conversation you have just heard.

Questions 19 to 22 are based on the passage you have just heard.

It is important to realize that the same technology that helps us may also harm us. We can prevent this from happening by carefully controlling the new technology. As one expert says," we must remember that it is the intelligent application of technology that will lead us to success. \

设f(x)=ke-|x|(-∞＜x＜+∞)是一概率密度，则k=______．

A. Before 10:00 am. B. Around noon.
B. C. At 4:00 pm. D. In the evening.