托福TPO58口语原文+音频下载（第三部分）

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TPO58口语原文

#3

Compound Nesting

Sometimes two different species of insects live close together, side by side. The two insect groups might even share the same home. But the two species often are different enough that they do not have to compete for the same resources, and therefore they can avoid conflict. This is known as compound nesting. Compound nesting actually provides advantages to both species: because living closely together can result in a specific benefit to each group, benefits that increase both species

‘ chances of survival

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

0k. So for example, there are these two different types of ants in Africa that share space in this way, living inside a hollow tree branch. And One of these types of ants is very small, and the other type is much bigger, so they're different. And What's interesting is that the bigger ants collect

food and bring it back to the hollow tree branch and eat it there. But some of the pieces of food end up scattered around small bits of waste that the bigger ants don't eat. And the tiny ants go round and eat these leftover scraps of food.So the tiny ants get their food this way from the scraps left behind by the bigger ants, and they don't have to go out to collect their own food.Scientists think that this arrangement works out nicely for the bigger ants too.See, when the small ants eat up all the little crumbs and scraps left behind, they're actually helping to keep the home inside the tree branch clean. And keeping the inside clean like this prevents harmful bacteria from growing, bacteria which could cause sickness and threaten the survival of the bigger ants.

Explain how the example from the professors lecture illustrates the concept of compound nesting.

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