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Passage ThreeQuestions 22 to 25 are based on the passage you have just heard.

A. Because it is extremely dangerous to conduct such research on an airplane.
Because it remains a mystery what wavelengths are liable to be interfered with.
C. Because scientists have not been able to produce the same effects in labs.
D. Because experts lack adequate equipment to do such research.

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( )垄断竞争的运输市场寡头垄断的运输市场是两种极端市场。

A. 对
B. 错

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Questions 1 to 8 are based on the conversation you have just heard.

A. She didn’t like the books the man bought.
B. There wasn’t a large selection at the bookstore.
C. The man bought a lot of books.
D. She wanted to see what the man bought.

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简述商品综合方案的主要内容。

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Passage OneQuestions 16 to 18 are based on the passage you have just heard.

A. The Wall Street Journal.
B. The Financial Times.
C. The Economist.
D. The Observer.

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Passage ThreeQuestions 22 to 25 are based on the passage you have just heard.

A. Because it is extremely dangerous to conduct such research on an airplane. Because it remains a mystery what wavelengths are liable to be interfered with. C. Because scientists have not been able to produce the same effects in labs. D. Because experts lack adequate equipment to do such research.

( )垄断竞争的运输市场寡头垄断的运输市场是两种极端市场。

Questions 1 to 8 are based on the conversation you have just heard.

简述商品综合方案的主要内容。

Passage OneQuestions 16 to 18 are based on the passage you have just heard.

A. Because it is extremely dangerous to conduct such research on an airplane.
Because it remains a mystery what wavelengths are liable to be interfered with.
C. Because scientists have not been able to produce the same effects in labs.
D. Because experts lack adequate equipment to do such research.