新托福聽(tīng)力加試題(編輯修改稿)
2025-02-10 09:14 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 reat that you are finding this all so interesting. I want you to e back to see me in a week so we can take a look at the new direction in your paper and evaluate the sources you’ve found in the meantime.題目：1. Why does the student go to se the professor?Answer: (C) he can not find enough material in writing his paper.2. How does the professor help the student?Answer: (A) 建議學(xué)生改變論文方向3. what information will the man probably include in his paper(click two)Answer: (B) analysis, (D) focus on one topic4. Why does the student mention that birds migrate at night?Answer: (A) 通過(guò)說(shuō)這個(gè)topic 來(lái)驗(yàn)證自己理解了老師的意圖。5. Listen again: S: Well, I wanted to write about bird migration, but I’m having trouble finding enough sourcesP: you are having trouble finding sources on bird migration?Answer: (B) 教授認(rèn)為找資料很容易6. Lecture: Rafflesia( 大王花)文章：We’ve been talking about plant classifications and how species belong to a family and families belong to an order, but sometimes, figuring out how we assign certain plant species to a particular order is challenging, even if the plant has…. unusual characteristics. You’d think that plants with similar characteristics would belong to the same order, but that’s not always true. A good example of this is a flower, that is – a flowering plant—that grows only in Malaysia and Indonesia, called Rafflesia.As you can see, Rafflesia is a pretty unusual plant. For starters, it’s huge. The flower can grow up to meter in width and can weigh up to seven kilos—pretty big, huh. There aren’t any other specimens in the plant world that have flowers even close to this size. But that’s not the only unusual characteristics of Rafflesia, in fact, that’s probably one of the least strange features of the plant.The plant also emits a terrible stench, like rotting meat. But again, there are other plants with bad smelling flowers. And in the case of Rafflesia, flies are attracted to that smell, and that’s how the flowers get pollinated. So… um… Rafflesia’s flowers are huge and smelly. Rafflesia is also a parasite。 it gets its energy from another plant instead of from the sun, which is unusual, but not unheard of in the plant kingdom. It actually grows inside its host, which is a type of grapevine. I mean… it grows inside its host until it blooms—it doesn’t bloom inside the host. But that leads me to … I want to tell you really quickly about another plant, a plant that’s also from the forests of Southeast Asia, called Mitrastema.Now, Mitrastema is also a parasite, which led some to believe that Rafflesia was related to Mitrastema—that they belong to the same order. Mitrastema as I said is a parasite, but its flowers are much smaller, and don’t smell bad, so you can see why there was debate about whether tey were related. But as it turns out, Mitrastema is actually related to blueberries. So, even plants that share an unusual characteristic with Rafflesia are not related to it. And, um… no plant shares all three of its unusual characteristics, and that made classifying Rafflesia very, very difficult.Now, you are probably thinking, why don’t they just analyze the DNA of the plant well, as I said, Raflesia is a parasite. It lacks the leaves。 the green tissue that most plants need for photosynthesis. It’s unable to … um… to capture the sunlight most other plants use to make food. So, it’s lacking… it.. it.. it doesn’t have the DNA—the genes for photosynthesis, which is what we ususlly use to classify plant species. But some researchers in Michigan persisted, and analyzed about 90 species of seed plants and pared them to Raflesia, and we finally had an anser. Rafflesia was part of the malpighiales order.Now, other species in the Malpighiales order include violets.. um.. poinsettias.. uh.. passion flowers… what else Willows. So it was pretty unexpected because flowers like violets are a lot smaller than Rafflesia, right and they don’t smell bad they don’t
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