TPO56听力Lecture4原文+MP3+题目+答案下载

TPO56听力Lecture4原文+MP3+题目+答案下载

TPO56听力Lecture4原文：

Listen to part of a lecture in an environmental science class.

Before we get started. I wanna tell you a little story. I guess it was about 10 years ago, I decided with my family, I decided it was time to buy a house. And my two kids really wanted a house near the ocean as close to the teach as possible. Well I tried to explain all the reasons that building near the ocean just didn't make sense environmentally, but the kids still wanted a house near the ocean. So my wife and I looked at a few houses and they were beautiful. There was one we saw that I still call our family's dream house. But we were lucky. Um And I'll tell you why in a moment when we realized that we just couldn't afford any of those houses. So I said building near the ocean doesn't make sense environmentally. But what is it about the coastal environment that makes most of the land there unsuitable as a building-site?

Let me explain coastal zones first. Imagine standing at the water's edge and moving away from the ocean. We come across different coastal zones, going in order. They are the beach, which I'm sure you're all familiar with. Second is the primary dune, which is the most fragile zone. Next is the trough. That's trough , after the trough is the secondary dune. And Finally, you come to what's called the back dune. So. the beach, if I say it's not advisable to build houses on the beach, uh right on the shoreline, I don't think you'd find it difficult to imagine why. you've got the sand, which is not very supportive for building. And you've got daily tidal fluctuations. Keep in mind too, that the sands are always shifting. And the shorelines moving, right near here, you've got sandy peninsula, and you can walk out on that peninsula almost a mile to sandy point. But it wasn't that long ago, I think, back when my grandfather was a boy, that sandy point was an island, and you couldn't just walk there from the mainland. Right? The sands shift and the shorelines move.

Before we continue this imaginary walk, I want you to think for a minute. Why are these coastal zones important? Well Environmentally, their role is protecting the inshore areas from being flooded with saltwater, from being damaged during storms and and they allow vegetation to grow further inland by providing sort of a buffer zone to protect against wind and salt spray.

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TPO56听力Lecture4题目：

1. What is the professor’s main point about coastal zones? 

A They are all constantly changing. 

B They are all likely to be damaged during storms. 

C They are not all suitable locations for buildings.

D They are not all capable of supporting vegetation.

2.According to the professor, what change has taken place at Sandy Point?

A. The houses on Sandy Point are no longer safe to live in. 

B. New environmental laws prohibit building and recreation. 

C. Both the beacn and the primary dune have eroded. 

D. Shorelines in tne area are different than they were years ago.

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