题目内容
定期租船是指由船舶出租人向承租人提供约定的由出租人配备船员的船舶，由承租人在约定的时间内按照约定的用途使用，并支付租金的一种租船方式。这种租船方式以约定的使用期限为船舶租期，而不以完成航次次数多少来计算，租期的长短完全由船舶出租人和承租人根据实际需要约定。()
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Many of Levi Strauss'【C3】______were cowboys and miners,【C4】______needed clothing that was【C5】______and durable. Strauss found a【C6】______fabric that was comfortable and lasted a long time,【C7】______"serge de Nimes," which was later【C8】______to the word denim.
Jacob Davis, a【C9】______, bought large mounts of the denim fabric from Levi Strauss. One of his customers was【C10】______tearing the pockets【C11】______his pants. So Jacob Davis decided to put rivets (铆钉) on【C12】______parts of the pants to make them stronger. The customer【C13】______the new pants【C14】______much that he told all his Mends, and soon Jacob Davis was busy【C15】______pants with rivets.
Jacob Davis【C16】______that using rivets was a great business idea, and he didn't want anybody to【C17】______that. He decided to get a patent (专利权). But【C18】______poor, he couldn't【C19】______the patent. So he went to Levi Strauss. He said, "If you agree to pay for the patent, we will【C20】______the profits." Levi Strauss agreed, and the new business was born. Today Levi's name is more popular than before.
【C1】
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
(33)
听力原文：M: How are your new neighbors, Nancy？
W: They seem nice enough, but they have a son who's driving me crazy.
M: What do you mean？
W: He comes home every Right around 10 with his car windows rolled down and radio blaring. It stops as soon as he alms the car off. But by then Brian and Lisa are wide awake.
M: Oh, no.
W: Oh, Yes. Sometimes it takes us till mid-night just to calm them down again.
M: Have you tried talking to them？
W: We haven't even really met them yet except to say a quick hello. I hate to get off on our own foot.
M: You are not going to like them when you do meet them finally.
W: I know, but I feel stupid complaining.
M: You said yourself it is driving you crazy.
W: Well, you know how early I have to get up to be here at the office. I'm just not getting enough sleep and neither are the kids.
M: Maybe you could go over sometime with a little gift: a plant for the yard or something. Then you could ask about their son whether they have any other children and they'll be sure to ask about yours.
W: Yeah, and then what？
M: Then you could mention that the hardest thing at this stage is getting your kids to go sleep at Right.
W: And keeping them in the sleep.
M: That's the idea. And you should do it soon. The longer you wait, the harder it'll be to do it politely.
(29)
"I have great confidence that by the end of the decade we'll know in vast detail how cancer cells arise," says microbiologist Robert Weinberg, an export on cancer. "But," he cautious, "Some people have the idea that once one understands the causes, the cure will rapidly follow. Consider Pasteur. He discovered the causes of many kinds of infections, but it was fifty or sixty years before cures were available."
This year, 50 percent of the 910, 000 people who suffer from cancer will survive at least five years. In the year 2000, the National Cancer Institute estimates, that figure will be 75 percent. For some skin cancers, the five-year survival rate is as high as 90 percent. But other survival statistics are still discouraging: 13 percent for lung cancer, and 2 percent for cancer of the pancreas (胰腺).
With as many as 120 varieties in existence, discovering how cancer works is not easy. The researchers made great progress in the early 1970s, when they discovered that oncogenes (致癌基因), which are cancer causing genes (基因), are inactive in normal cells. Anything from cosmic rays to radiation to diet may activate a dormant oneogene, but how remains unknown. If several oncogenes are driven into action, the cell, unable to mm them off, becomes cancerous.
The exact mechanisms involved are still mysterious, but the likelihood that many cancers axe initiated at the level of genes suggests that we will never prevent all cancers. "Changes axe a normal part of the evolutionary process," says oncologist William Hayward. Environmental factors can never be totally eliminated; as Hayward points out, "We can't prepare a medicine against cosmic rays."
The prospects for cure, though still distant, are brighter. "First, we need to understand how the normal cell controls itself. Second, we have to determine whether there are a bruited number of genes in cells which are always responsible for at least part of the trouble. If we can understand how cancer works, we can counteract its action."
Why does the author mention the example of Pasteur？
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