单项选择题

Questions 11 to 14 are based on the following passage. At the end of the passage, you will be given 10 seconds to answer the questions. Now listen to the passage. Why did Alfred Nobel invent dynamite

A．To defeat enemies.
B．To earn more money
C．To improve the peacetime industries of mining and road building.
D．To replace the old explosive.
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单项选择题
What can we learn about Alfred Nobel from the passage
A．He remained single all his life.
B．He was cheerful in private.
C．He father was very successful.
D．He was a man of few contrasts.
单项选择题
Why sometimes do people fail to tell the sex of an athlete
A．Female athletes are physically stronger.
B．Male athletes are running slower.
C．Some athletes are taking drugs and steroids.
D．Some people are near-sighted.
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