九年级英语全册 Unit 5 What are the shirts made of?单元清课件.ppt
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1、 单元清阅读理解。AHave 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.These reflected sounds are called“echoes”.We can use refl
2、ected 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 card
3、board about fifty centimeters long.Put one end over your ear and hold the watch at the other.Now you can hear the watch because 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
4、 into a beam which can travel a long way.In the ship,the sailor uses the megaphone to make his voice travel.Without the megaphone,his voice cannot travel far.We use reflected sound in many ways.We use it to measure the depth of the sea,for example.Among the animals,bats and whales use reflected soun
5、d to tell them where they are and what things are near them.1.What is called“echo”?AThe sound that is made by man or animals comes back from some place.BVery loud voices that are made by man.CVery loud voices that are made by animals.2.We can hear our echoes if we _Ashout in a small roomBshout in a
6、large house full of thingsCshout in narrow valleys(山谷)3.From the text we learn that _.Areflected sound is useful only to blind people Bpeople havent made use of reflected sound yetCbats use reflected sound to fly and get food 4.If you havent got a megaphone,_ will help you to make your voice travel
7、farther.Aa long piece of wood Ba roll of cardboardCa thin thread ACCB B Andy was still traveling in Spain when he realized he had to confirm(确认)his _ with the airline company.He was visiting Spain in order to improve his Spanish.When_he_was_speaking_to_people_face_to_face,_he_had_no_difficulty_under
8、standing_what_they_said.However,when he was speaking on the phone,he still had a problem.Andy called the airline.And the clerk confirmed that his plane was leaving at nine oclock three days from that day.She also told Andy to be at the airport a little earlier in order to check in his luggage and ge
9、t a seat.Since he was leaving in three days,Andy didnt lose any time.He visited as many places as he could.He thought that it would probably be a while before he had enough money again.He wished he could come back and spend a year in Spain.Too quickly,the final day arrived.Andy left early for the ai
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