2019年12月1日托福听力机经预测

来源:智课教育 时间:2019-11-27 13:20:07

   托福听力部分的考前练习中,机经内容可以缩小大家的备考范围,让大家利用更短的时间,来突破托福听力的备考障碍。因此今天小编为大家带来了2019年12月1日托福听力机经预测,希望对大家备考有所帮助。

  Narrator: Listen to part of a lecture in an ecology class.

  Professor: So we’ve been looking at threats to the survival of many species of plants and animals all over the world. Two threats that we’ve identified are climate change and habitat destruction. So now the question is what can be done to save these species? Stephanie?

  Stephanie: Well, we can stop burning fossil fuels. You know, use solar or wind energy.

  Male: I heard about the seed banks all over the world. Scientists are collecting seeds from all kinds of plants so they don’t become extinct and they’re also breeding threatened animals. Of course, that probably means in zoos.

  Professor: Okay. These are definitely approaches being used. But there’s another alternative that more and more conservationists and ecologists are looking at. It’s called assisted migration. Assisted migration is the process of physically moving an entire species from a habitat where they are endangered to a new habitat that’s more hospitable.

  Stephanie: But you know, that reminds me that species of shrimp you told us about before, the one that wildlife managers introduced into a lake in Montana because they thought it would be suitable food for some of the lake’s fish? But the shrimp became invasive. It ended up competing with the fish for its food and disrupting the entire lake’s food web.

  Professor: Yes, and sometimes the species will occupy a wider area than intended. And it’s because of risks like these that this is a very controversial idea.

  Male: Has it ever been done successfully?

  Professor: It seems so. In the late 1990s, with populations of two butterfly species in England, climate data had shown that the butterfly’s habitat was experiencing warmer temperatures, which was directly affecting their ability to reproduce so conservationists used computer climate models to locate areas that could provide a more suitable habitat. First, one species was moved about 35 kilometers north, and the following year, the other species was moved about 65 kilometers north. And for over 20 years, both species had been followed very closely. So far anyway, we haven’t seen any negative consequences.

  Stephanie: Wow. But how do you decide which species to move and where to move them?

  Professor: Well, researchers have come up with a set of criteria. First of all, only species that are at a high risk of extinction because of climate change, or habitat destruction are even considered. And obviously there’d have to be a suitable place to reestablish the species. But mostly importantly, the benefits of relocation would have to outweigh the biological cost. However, the problem with this criterion is that we don’t see the biological costs until the damage has been done, as in the case of the shrimp.

  So okay, let’s see how well one animal, the Iberian desman, fits these criteria. The Iberian desman is a semi-aquatic animal that lives among fast-flowing streams in the Pyrenees Mountains of southern France and northern Spain. Researchers considered the Iberian desman a good candidate for relocation for two reasons. First, it’s found in only in a very limited area. This suggests that for whatever reason, they can’t easily migrate to a new habitat on their own. Well, that’s a problem because the streams and rivers that the Iberian desman inhabits are becoming polluted. Plus, there’s the additional problem of an increasing number of hydro-electric plants in that area. This is leading to a fragmentation of the Iberian desman’s habitat. So, the destruction of their habitat is clearly putting them at risk.

  Now, add to that the predicted effects of climate change. Higher temperatures, lower rainfall, and well, assisted migration of the Iberian desman becomes an attractive prospect for researchers. In fact, they’ve identified several areas in Europe: in the Alps, in Scotland, and in Scandinavia that could be suitable for these animals.

  Stephanie: But what about the risks?

  Professor: Well, researchers are considering the risks. But the Iberian desman shares its current habitat with the same competitors that are found in these new habitats. Not only that the animals that currently prey on the Iberian desman also inhabit the new areas. And the fact that the species has never show signs of expanding its current range, all these factors suggest that it might not become invasive and accept the natural balance of things.

  Male: So, has this assisted migration of this animal… They’re going to do it?

  Professor: For now, it’s just a proposal. As I said, assisted migration is still a controversial idea and even the researchers who are behind the proposal are being very cautious, and with good reason. I mean, so far there’s only been one feasibility study.

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