.1.你們的學校旅行是什么時候？

__________________ iS your school___________ ？

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Wind is the great maker of waves. There are exceptions, such as the tidal (潮汐的）waves sometimes produced by earthquakes under the sea. But the waves most of us know are produced by winds blowing over the sea.

Now before constructing （創(chuàng)立）an imaginary life history of a typical wave, we need to know certain physical things about it. A wave has height, from trough (low point) to crest ( high point). It has length — the distance from this crest (浪尖）to that of the following wave. The period of the wave means the time it takes for succeeding crests to pass a fixed point. None of these things stays the same —for all depend on the wind, on the depth of the water and many other matters.

The water that makes up a wave does not move forward 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 first position. And it is lucky that this is so. For if the huge masses of water that make up a wave actually moved across the sea, sailing would be impossible.

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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.

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B. The wavelength of Wave 1 is a little longer than that of Wave 2.

C. The wavelength of Wave 2 is longer than that of Wave 1.

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1.  read the textbook                           A.聽磁帶

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(   )4.1 felt it hard to keep up with my classmates. But whenever I want to_______________ ， my teacher always encourages me to work harder.

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