If we want to find the speed of a wave, we may use the following way:

　　Speed = wavelength × frequency

　　Here, wavelength is the distance between two high points (crests), frequency means the number of cycles per second

　　1. What causes waves?

　　A. Earthquakes and nothing else.

　　B. Only wind.

　　C. Wind causes most waves.

　　D. Wind causes some waves.

　　答案解析：答案为C。本题为细节题。由第一段的最后一句话 “But the waves most of us know are produced by winds blowing over the sea.” 可知，答案为C。

　　2. Which of the following is true according to the passage?

　　A. The water of a wave moves away across the sea.

　　B. The water of a wave remains almost at the same place.

　　C. The water of a wave goes with the passing of the wave.

　　D. The length of a wave means the distance from the top of a wave to the bottom.

　　答案解析：答案为B。本题为细节题。从第三段 “The water that makes up a wave does not advance with it across the sea. Each drop of water turns around in a little circle with the passing of the wave, but returns very nearly to its original position.” 可知，组成波的水并不随着波的前进而前进，每一滴水随着波的前进形成了一个小圆圈，但是几乎回到原位置。故A，C错误，B选项正确。最后一段提到 “Here, wavelength is the distance between two high points (crests)…”, 故答案D错误。

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