托福TPO71听力Lecture1原文+题目+答案+MP3音频下

托福TPO71听力Lecture1原文+题目+答案+MP3音频下

托福TPO71听力Lecture1原文：

Listen to part of.Lecture in an ecology class.

We've been talking about the factors that influence the development of certain ecosystems. We've looked at the large role that climate plays, but today I wanted to touch on an ecosystem where fire actually plays a bigger role than climate savannas. Now, savannas are usually flat grasslands with scattered trees. They're more common in Africa in both high rainfall areas and low rainfall areas. But regardless of where they are.

Almost all severe.

As experienced bush fires to 1 ° or another. Those fires really play a central role in how savanna vegetation is maintained. Mike.

So savannas in high rainfall areas also have a lot of fires. That seems strange to me. I mean you would think that the weather, the area, the fewer number of fires you'd have.

Yeah. It's Cameron.

Intuitive. But the key here is seasonality, which is a distinctive feature of savannas.

So high rate.

Painful areas can have dry seasons. That's when the high rainfall savanna's burn. After a long, dry season has caused the grass to become especially dry. Very dry grass is almost like tinder. It will burn very easily and very quickly.

Also hiring.

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托福TPO71听力Lecture1题目如下：

(1)、(单选题) What is the lecture mainly about?

A.How climate affects the ecosystem of savannas

B.How fires in savannas differ from fires in forests

C.The effects of fire on savanna ecosystems

D.The similarities between different savanna regions

(2)、(多选题) What are two features of savannas in high-rainfall areas that make them vulnerable to fires?

A.They have long periods without rain

B.They have trees spaced close together

C.They have tall trees that attract lightning

D.They have tall grass.

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