Have you ever heard an echo of your voice? An echo is a reflected(反射)sound. Stan

题文

Have you ever heard an echo of your voice? An echo is a reflected(反射)sound. Stand in a very large, empty hall with nothing on the walls. Then shout. The sounds you make will hit the walls and come back to you. The walls reflect the sounds. The reflected sounds are called “echoes”. We can u reflected sound to make sound travel farther. Hold a watch about fifty centimeters from your ear. You cannot hear it. The sound of the watch travels a short way in all directions. It does not travel as far as your ear. You can make it travel to your ear by using a roll of cardboard(纸板筒). Make the roll of cardboard about fifty centimeters long. Put one end over your ear and hold the watch at the other. Now you can hear the watch becau the sound has not gone in all directions. It is reflected down the roll to your ear. A megaphone(喇叭筒)works in the same way. It makes sound travel farther. It reflects the sound into a beam which can travel a long way. In the ship, the sailor us the megaphone to make his voice travel. Without the megaphone, his voice cannot travel far. We u reflected sound in many ways. We u it to measure the depth of the a, for example. Among the animals, bats and whales u reflected sound to tell them where they are and what things are near them.小题1: Which is the right order of hearing our echo in a very large, empty hall? a. We hear the reflected sound       b. The sound returns to us   c. The sound hits the walls          d. We make a soundA．c, b, a, dB．c, a, b, dC．d, c, b, aD．d, b, c, a小题2:. From the text we learn that __________ . A．reflected sound is uful only to blind peopleB．people haven’t made u of reflected sound yetC．bats u reflected sound to fly and get foodD．whales don’t u reflected sound as they live in the a小题3: If you haven’t got a megaphone, ____ will help you to make your voice travel farther.A．a long piece of woodB．a roll of cardboardC．a thin threadD．a long piece of silk

题型：未知 难度：其他题型

答案

小题1:C 小题2:C 小题3:B 

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解析

小题1:理解排序题，根据文中语句理解可知。小题2:细节理解题，根据文中语句“Among the animals, bats and whales u reflected sound to tell them where they are and what things are near them.”理解可知。小题3:细节理解题，根据文中语句“You can make it travel to your ear by using a roll of cardboard”理解可知。

考点

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