[沖刺中考]英語(yǔ)閱讀與填空：22-Tuesday 回聲 219詞

22-Tuesday 回聲 219詞

題材： 回聲　 詞數(shù)： 219　 建議閱讀時(shí)間： 4.5分鐘

閱讀下面的短文，選擇正確答案。

Have you ever heard an echo of your voice？

An echo is a reflected 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 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．

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 because the sound has not gone in all directions．It is reflected down the roll to your ear．

A megaphone 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 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 sound to tell them where they are and what things are near them．

生詞

echo　n． 回聲：The echoes of his scream sounded in the cave for several seconds．他的尖叫聲在洞中回蕩了好幾秒。

reflect　v． 反射：A mirror reflects light．鏡子反射光。

roll　n． 卷筒狀物：a toilet roll手紙卷

cardboard　n． 硬紙板：We covered the hole with a sheet of cardboard．我們用一張硬紙板蓋住洞口。

megaphone　n． 麥克風(fēng)，話筒：The police chief addressed the huge crowd through a megaphone．警察局局長(zhǎng)通過話筒向密集的人群喊話。

beam　n． 光束，波束：a laser beam激光束

1．What 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．

2．We 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

D．shout in the open air

3．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 sound．

A．c b a d

B．c a b d

C．d c b a

D．d b c a

4．From 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

5．If you haven't got a megaphone，________will help you to make your voice travel farther．

A．a(chǎn) long piece of wood

B．a(chǎn) roll of cardboard

C．a(chǎn) thin thread

D．a(chǎn) long piece of silk

參考譯文

你聽到過自己的回聲嗎？

回聲是經(jīng)過反射的聲音。站在一間空無(wú)一人、墻上沒有東西的大禮堂里大叫，你發(fā)出的聲音碰到墻壁，就會(huì)反射到你那里。墻反射聲音。那些被反射回的聲音就叫做“回聲”。

我們可以利用回聲讓聲音傳播得更遠(yuǎn)。把一只手表舉在距離你耳朵50厘米遠(yuǎn)的地方，你聽不到它的響聲。手表的聲音向四面八方傳播時(shí)，只能走很短的距離。它到達(dá)不了你耳朵那么遠(yuǎn)。你可以把紙板卷成筒狀，以此讓手表的聲音傳播到你耳朵里。

把紙板筒做成50厘米長(zhǎng)。一端扣在耳朵上，把手表放在另一端。現(xiàn)在你能聽到手表的聲音了，因?yàn)槁曇魶]有向四面散開。它沿著卷筒反射到了你的耳朵里。

麥克風(fēng)的工作原理就是這樣。它能讓聲音傳播得更遠(yuǎn)。它把聲音反射成一束，這樣就能傳播很遠(yuǎn)的距離。船上的水手用麥克風(fēng)讓自己的聲音傳播出去。沒了麥克風(fēng)，他的聲音傳不了多遠(yuǎn)。

我們?cè)谠S多方面利用回聲。比如，我們用它測(cè)量海水的深度。動(dòng)物中的蝙蝠和鯨都能利用回聲來確定自身所處的位置，判斷周圍有什么東西。

參考答案

Tuesday 1．D　2．C　3．C　4．C　5．B