Wind is the great maker of waves. There are exceptions (例外), such as the tidal (潮汐的) waves sometimes caused by earthquakes under the sea. But the waves most of us know are caused by winds blowing over the sea .
Now let’s learn some physical (自然地理學(xué)的) things about it. A wave has height, from low point to high point . It has length (長度)--the distance from this high point to that of the following wave. The period of the wave means the time it takes for succeeding high points to pass a fixed point. None of these things stays the same--for all depend upon (依靠)the wind, upon the depth (深度) of the water and many other matters.
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 (原先的位置). And it is lucky that this is so. For if the huge groups of water that make up a wave really moved across the sea, sailing would be impossible. If we want to find the speed of a wave, we may use the following way : Speed =" wavelength" × frequency (頻率).
Here, wavelength is the distance between two high points , frequency means the number of cycles per second
小題1:What causes waves?
A．Earthquakes and nothing else. B．Only wind.
C．Wind causes most waves. D．Wind causes some waves.
小題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.
小題3:The speed of Wave 1 is 100 cm/s, frequency 10. The frequency of Wave 2 is 300, while its speed is twice that of Wave 1. Which of the following is right?
A．The wavelengths of the two are equal.
B．The wavelength of Wave 1 is 10 times longer than that of Wave 2.
C．The wavelength of Wave 2 is longer than that of Wave 1.
D．The wavelength of Wave 1 is longer than that of Wave 2.
小題4:Where can we find this passage?
A．music magazineB．fashion magazineC．scientist magazineD．sports magazine

小題1:C
小題2:B
小題3:D
小題4:C

小題1:根據(jù)文章內(nèi)容第一段Wind is the great maker of waves. There are exceptions (例外), such as the tidal (潮汐的) waves sometimes caused by earthquakes under the sea.可知答案A和B是錯誤的，而根據(jù)文章內(nèi)容第一段But the waves most of us know are caused by winds blowing over the sea .可知答案D是錯誤，故選答案為C
小題2:根據(jù)文章內(nèi)容第三段內(nèi)容The water that makes up a wave does not advance with it across the sea，可知答案A是錯誤的；根據(jù)文章內(nèi)容第三段內(nèi)容Each drop of water turns around in a little circle with the passing of the wave, but returns very nearly to its original position (原先的位置).可知答案為B項的說法是正確的，同時C項的說法是錯誤的；又根據(jù)文章第二段的內(nèi)容. A wave has height, from low point to high point，可知答案為D項說明的內(nèi)容是錯誤的，故選B
小題3:根據(jù)文章內(nèi)容第三段的內(nèi)容If we want to find the speed of a wave, we may use the following way : Speed =" wavelength" × frequency (頻率).根據(jù)題目中所給的信息，可知答案為D
小題4:根據(jù)文章整體的內(nèi)容和文章內(nèi)容第二段內(nèi)容Now let’s learn some physical (自然地理學(xué)的) things about it.可知答案為C，介紹的地理相關(guān)知識，自然是來自科學(xué)雜志。
點評：學(xué)生在做此項閱讀理解時，要注意專業(yè)知識的闡述，把握好知識點。
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科目：初中英語 來源：不詳 題型：完形填空

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閱讀理解
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