( )陆桥运输和空桥运输的区别在于：在整个运输过程中,陆桥运输使用的是不同的集装箱,而空桥运输使用的是同一集装箱,不用换装。
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Passage TwoQuestions 19 to 21 are based on the passage you have just heard.
A. He didn’t like physics any more.
B. His eyesight was too poor.
C. Physics was too hard for him.
D. He had to work to support himself.
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。
A. 对
B. 错
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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