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托福TPO60口语原文（第三部分）
Deceptive Caching When food is plentiful, animals often collect and hide extra food to eat when it is scarce. However, other animals may try to steal this stored food: and eat it themselves. To protect their food supply, some animals engage in deceptive caching. Using this technique: animals deceive other animals into thinking that food is hidden in one place： while it is actually hidden somewhere else. Deceptive caching tricks animals that try to steal food, making it harder for them to find the food supply. If their attempts at stealing food are repeatedly unsuccessful, the animals often become discouraged and stop trying to steal hidden food.
Now listen to part of a lecture in a biology class.
0k, so here's a good example of this. Recently, a team of researchers was observing a certain type of squirrel eastern gray squirrels gathering nuts for the winter. And Of Course Gray squirrels try to gather enough nuts so that they'll have food to eat. All winter long, And They dig holes in the ground and bury the acorns there. But here's what's interesting. The gray squirrels don't always put nuts in all of the holes they dig. If there's another animal nearby that might want to eat the nuts, say uh a bird, like a blue Jay, the squirrel might dig a whole bunch of holes. But instead of putting nuts in all of them, the squirrel will just drop a twig or a stone in most of the holes, and only put nuts in a few. But even though there aren't any nuts in some of the holes, the squirrel will still go through the same process of covering these holes up with leaves and dirt as though they actually had nuts in them. So then a blue Jay might find these holes and start digging in them. But since most of the holes only have a twig or a stone inside, the blue jay wouldn't find a lot of nuts. So after a while, it would lose interest and give up looking. Explain how the example of the eastern gray squirrel illustrates the concept of deceptive cashing.
Explain how the example of the eastern gray squirrel illustrates the concept of deceptive caching
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