73.What causes waves?
A. Earthquakes and nothing else. B. Only wind.
C. Wind causes most waves. D. Wind causes some waves.
74.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.
75.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.
56-65 CDBCB,ABBDC 66-75 ABBCD,DACBD
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