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段落1

NARRATOR

Now listen to part of a lecture on the topic you just read about.

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段落2

The cane toad won’t be as easy to get rid of as the reading suggests.

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The measures proposed by the reading are likely either to be unsuccessful or to cause unwanted environmental damage.

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段落3

First of all, a national fence probably won’t stop the spread of the toad.

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That’s because young toads and toad eggs are found in rivers and streams.

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No matter where the fence is located, at some point there will be rivers or streams flowing from one side to the other.

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These waterways will be able to carry the young toads and their eggs to the other side.

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Since it’s only necessary for a few young toads or eggs to get through the fence in order to establish population on the other side, the fence is unlikely to be effective.

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段落4

Secondly, a massive group of volunteers could have success trapping and destroying toads.

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But it’s likely that these untrained volunteers would inadvertently destroy many of Australia’s native frogs—some of which are endangered.

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It’s not always easy to tell the cane toad apart from native frogs, especially when it’s young.

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段落5

Third, using the virus is a bad idea because it could have terrible consequences for cane toads in their original habitat in Central and South America.

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You might be wondering, how can a virus released in Australia cause harm in the Americas?

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Well, Australian reptiles and amphibians are often transported to other continents, by researchers or pet collectors, for example.

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Once the animals infected by the virus reach Central and South America, the virus will attack the native cane toads and devastate their populations.

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That would be an ecological disaster because in the Americas, cane toads are a native species and a vital part of the ecosystem.

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So if they’re eliminated, the whole ecosystem will suffer.

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