2021-11-20来源：

托福TPO74听力Lecture2原文+题目+答案+MP3音频下载

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

Okay, we've talked about renewable energy as an alternative way of generating electricity, alternative to what? To nonrenewable energy, such as coal or petroleum or natural gas. Something that will eventually run out of, because we're consuming it at a faster rate than it's being regenerated. Okay, so what's our primary source of renewable energy? Can the sun? Yes. But it's not so easy to use it to generate electricity because uh, it doesn't work at night. Okay? And it doesn't work very well in places where it's cloudy a lot of the time. That's right. And the sun's energy is not that easy to capture. We're trying to use giant panels called solar cells to capture the sun's rays and convert them into electricity. And we've had some success. But, well, let's just say that the idea of using the sun, as the principal source of energy in the United States is, well, as someone once said, it's kind of like the sun itself big and bright, but further away than it seems.

Okay, now let's talk about the ocean as another source of renewable energy. The ocean has 2 kinds of mechanical energy that we can use, the tides, and the waves. In order to use tides, to generate electricity, the difference between high and low tide has to be at least 5 meters or about 16 feet. They're only about 40 places on the planet with that kind of tidal range. And there's actually only one really big tidal energy power station in the world that's in France. Yes, Susan. So do they build a dam like they do it on some rivers? Yes. They build a dam across the bay and they have gates and turbines in the dam. And when the tides produce the required difference in the water level on opposite sides of the dam, the gates are opened and waters force through the turbines, which turn a generator which produces electricity............余下托福TPO74听力Lecture2原文省略！

1. What is the lecture mainly about?

A. The history of power plants in the ocean

B. Differences between renewable and nonrenewable energy

C. Ways of using the ocean as a source of energy

D. Attempts to convert solar energy into electricity

2. What is the professor's opinion about solar energy?

A. He believes that its benefits outweigh its costs

B. He believes that it is more efficient than ocean energy

C. He thinks that it is an especially efficient energy source for tropical regions

D. He thinks that it will be a long time before it replaces nonrenewable energy sources

.........余下托福TPO74听力Lecture2题目省略！

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