综合教程英语2课后答案(托福口语 TPO8 综合口语 TASK 4 参考答案)

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Task 4

Revealing coloration is a defensive strategy. Animals use this strategy to have an area of bright color, usually hidden from predators’ view, on some part of their body. When approached by a predator, the animal suddenly reveals the area of bright color. This unexpected display of color startles or confuses the predator and provides the would-be-prey with an opportunity to escape.

The professor gives us two examples to explain revealing coloration.

The first one is a large tropical insect called the Peanut Bug. Peanut Bugs front wings are colored so they blend in with their surroundings. But its back wings, which are usually closed and hidden, have these bright colorful spots on them. And when Peanut Bugs are attacked, they suddenly open the back wings and out pop the bright colors. And that surprises the predator and gives Peanut Bug a chance to get away.

The second one is a butterfly called the morpho butterfly. And parts of the morpho butterfly wings are very shiny and reflect a lot of sunlight. This shiny part of its wings is hidden when this butterfly is resting. But morpho butterflies are often attacked by birds. So, when a bird approaches, the morpho flies away. And when the morpho flaps its wings, all the bird can see are flashes of light reflected from the morpho's wings. Those flashes of light make it very difficult for the bird to follow the morpho. And the morpho is usually able to get away.

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