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What's the author's opinion about the new AI movement？

A. It has careated a sensation among artificial intelligence researchers but will soon die out.
B. It's breakthrough in duplicating human thought processes.
C. It's more like a peculiar game rather than a real scientific effort.
D. It may prove to be in the right direction though nobody is sure of its future prospects.

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Unless we spend money to spot and prevent asteroids(小行星) now, one might crash into Earth and destroy life as we know it, say some scientists.
Asteroids are bigger versions of the meteoroids(流星) that reace across the night sky. Most orbit the sun far from Earth and don't threaten us. But there are also thousands of asteroids whose orbits put them on a collision course with Earth.
Buy $ 50 million worth of now telescopes right now. Then spend $ 10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we'll have a way to change its course.
Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn't be cheap.
Is it worth it？ Two things experts consider when judging any risk are: 1) How likely the event is; and 2) How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 500,000 years. Sounds pretty rare— but if one did fall, it would be the end of the world. "If we don't take care of these big asteroids, they'll take care of us," says one scientist. "It' s that simple."
The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth？ "The world has less to fear from doomsday(毁灭性) rocks than from a great nuclear fleet set against them," said a New York Times article.
What does the passage say about asteroids and meteoroids？

A. They are heavenly bodies different in composition.
B. They are heavenly bodies similar in nature.
C. There are more asteroids than meteoroids.
D. Asteroids are more mysterious than meteoroids.

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Paragraphs 4 and 5 mainly answer which of the following questions？

A. Who own pets in the United States？
B. Why do people raise pets？
C. What are the costs of owning pets？
D. What are the medical benefits of owning pets？

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Section A
Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.
(12)

A. Before the man bought a new house.
B. After the man and the woman talked about the purchase for the first time.
C. After the man bought a new house.
D. After the man has given up looking for a new house.

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A．Two centuries.B．300 years ago.C．In 1691.D．In the 16th century.

A. Two centuries.
B. 300 years ago.
C. In 1691.
D. In the 16th century.

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