【正确答案】 C

【答案解析】[听力原文]

Narrator
Listen to part of a lecture in a biology class. The class has been learning about birds.

Professor
OK. Today we"re going to continue our discussion of the parenting behaviors of birds.. And we"re going to start by talking about what are known as "distraction displays."

Now if you"re a bird, and there"s a predator around, what"re you going to do? Well, for one thing, you"re going to try to attract as little attention as possible, right? Because if the predator doesn"t know you"re there, it"s not going to try to eat you. But sometimes, certain species of birds do the exact opposite: when a predator approaches, they do their best to attract the attention of that predator. Now why would they do that? Well, they do that to draw the predator away from their nest, away from their eggs or their young birds. And the behaviors that the birds engage in to distract predators are called "distraction displays," and there are a number of different kinds of distraction displays.
Most of the time, when birds are engaging in distraction displays, they"re going to be pretending...either that they have an injury...or that they"re ill...or that they"re exhausted...You know, something that"ll make the predator think, "Ah, here"s an easy meal."
One pretty common distraction display is what"s called the broken-wing display. And, uh, in a broken-wing display, the bird spreads and drags a wing or its tail. And while it does that, it slowly moves away from the nest. So it really looks like a bird with a broken wing. And these broken-wing displays can be pretty convincing.
Another version of this kind of distraction display is where the bird creates the impression of a mouse or some other small animal that"s running along the ground. A good example of that kind of display is created by a bird called a "purple sandpiper."