托福TPO18口语Task4阅读文本+听力文本+题目+满分范文
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托福TPO18口语Task4阅读文本+听力文本+题目+满分范文

为了帮助大家高效备考托福,蘑菇教育小编为大家带来托福TPO18口语Task4阅读文本+听力文本+题目+满分范文,希望对大家备考有所帮助。

  为了帮助大家高效备考托福,蘑菇教育小编为大家带来托福TPO18口语Task4阅读文本+听力文本+题目+满分范文,希望对大家备考有所帮助。

  托福TPO18口语Task4阅读文本:

  Relict Behavior

  In general, animals act in ways that help them to survive within their specific habitats. However, sometimes an animal species may display a behavior that no longer serves a clear purpose. The original purpose for the behavior may have disappeared long ago, even thousands of years before. These behaviors, known as relict behaviors, were useful to the animal when the species’ habitat was different; but now, because of changed conditions, the behavior no longer serves its original purpose. Left over from an earlier time, the behavior remains as a relict, or remnant, long after the environmental circumstance that influenced its evolution has vanished.

  托福TPO18口语Task4听力文本:

  Now listen to part of a lecture in a biology class.

  Ok, uh, so a good example of this, found right there in North America, is something an animal called the American Pronghorn does. Prong Horns, as you may know, are a kind of deer-like animal, they live out in the open grassy plains, somewhat in the middle of America, and they are super fast. Pronghorns are, in fact, noted for being the fastest animal in the western hemisphere. Once a Pronghorn starts running, zoom! None of its present predators, like the bobcat or the coyote can even hope to catch up with it. It's off in a flash! Ok, so why then do Pronghorns run so fast? That's the question.Well, it turns out that quite a long time ago, I'm talking tens of thousands of years, things on the grassy plains used to be very different for the Pronghorns, because back then, lions used to live on the plains, chasing and preying upon the Pronghorns, and lions, of course, are a very swift-moving mammal, much faster than the bobcat or coyote or other predators you’d find on the plains today.But, now, however, lions are all extinct in North America, they’re no longer predator of the Pronghorn. Tens of thousands of years ago, though, the lions were there chasing the Pronghorns. So back then, the Pronghorn’s speed was critical to its survival.

  托福TPO18口语Task4题目:

  Using the example of the pronghorn and lion, explain the concept of a relict behavior.

  托福TPO18口语Task4满分范文:

  Relict behavior refers to a kind of behavior in animals that was critical to their survival a long time ago but serve no purpose now due to the change of the environment. In the lecture, the professor takes the American pronghorn that lives in North America. It's known as the fastest animal in the western hemisphere, and none of its present predators, like bobcat or coyote, can catch up with it. However, the pronghorn was fast for a reason a long time ago. Tens of thousands of years ago, there were lions on the grassland, and lions preyed on pronghorns. Since lions were very fast, the pronghorns, in order to survive, had to run for their life. That was how the pronghorn gained its speed. However, lions were extinct then, so the primary reason for the pronghorn's speed was gone. But the behavior remained, and became what's known as relict behavior. (153 words)

  以上是蘑菇教育小编给大家整理的托福TPO18口语Task4阅读文本+听力文本+题目+满分范文,希望对你有所帮助!

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