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- 31What is called "echo"、 _____
A.Very loud voices
B.Very loud voices that are made by man
C.Very loud voices that are made by animals
D.The sound that is made by man or animals comes back from some place
开始考试练习点击查看答案 - 32We can hear our echoes if we _____.
A.shout in a small room
B.shout in a large house full of things
C.shout in narrow valleys (山谷)
D.shout in the open air
开始考试练习点击查看答案 - 33Which 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
开始考试练习点击查看答案 - 34From the text we learn that _____.
A.reflected sound is useful only to blind people
B.people haven't made use of reflected sound yet
C.Bats use reflected sound to fly and get food
D.Whales don't use reflected sound as they live in the sea
开始考试练习点击查看答案 - 35If you haven't got a megaphone, _____ will help you to make your voice travel farther.
A.a long piece of wood
B.a roll of cardboard
C.a thin thread
D.a long piece of silk
开始考试练习点击查看答案
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