First listen and then answer the following question.
听录音，然后回答以下问题。
In what way does echo-location in bats play an utilitarian role?
Not all sounds made by animals serve as language, and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role.
To get a full appreciation of what this means we must turn first to some recent human inventions．Everyone knows that if he shouts in the vicinity of vpn软件免费 a wall or a mountainside, an echo will come back．The further off vpn免费 this solid obstruction, the longer time will elapse for the vpn免费下载 return of the echo．A sound made by tapping on the hull of a ship will be reflected from 免费vpn the sea bottom, and by measuring the time interval between the taps and vpn免费下载 the receipt of the echoes, the depth of the sea at that vpn软件免费 point can be calculated．So was born the echo-sounding apparatus, now in general use in ships．Every solid object will reflect a sound, varying according to the size and nature of the object．A shoal of fish will vpn免费下载 do this．So it vpn免费 is a comparatively simple step from locating vpn免费下载 the sea bottom to locating a shoal of fish．With experience, and with improved apparatus, it is now possible not only vpn免费 to locate a shoal but to tell if it is herring, cod, or 免费vpn other well-known fish, by the pattern of its echo.
It vpn软件免费 has been found that certain bats emit squeaks and by receiving the echoes, they can locate and steer clear of obstacles ---- or locate flying insects on which they feed．This echo-location in bats is often compared with radar, the principle of which is similar.
MAURICE BURTON Curiosities of animal life
New words and expressions生词和短语
bat（1.2）[bæt] n．蝙蝠
interval（1.6）['intəvəl]n．间隔
strictly（1.2）['strikti] adv．明确地
receipt（1.7）[ri'si:t] n．收到
utilitarian（1.2）[ˌju:tiliˈtɛəriən] adj．实用的
apparatus（1.8）[ˌæpəˈreitəs] n．仪器
appreciation（1.3）[əˌpri:ʃiˈeiʃən] n．理解
shoal（1.9）[ʃəul] n．鱼群
obstruction（1.5）[əbˈstrʌkʃən] n．障碍物
herring（1.11）['heriŋ] n．鲱鱼
elapse（1.5）[i'læps] v．消逝
cod（1.11）[kɔd] n．鳕鱼
hull（1.6）[hɔl] n．船体
squeak（1.13）[skwi:k] n．尖叫声
Notes on the text课文注释
1Not all sounds made by animals serve as language，动物发出的声音不全是作语言交际。此句采用了部分否定，即不是否定所有的动物，而只是一部分。serve as，作……之用。
2turn to，求助于。
3play a role in，在……方面起作用。
4in the vicinity of，在……的附近。
5So was born the echo-sounding vpn软件免费 apparatus，这样就诞生了回声探测仪。这是一个倒装句，主要是为了避免因主语过长而使全句失去平衡，同时也为了使apparatus的定语now in general use in ships 紧挨着名词。in general use，普遍使用。
Refer to the text to see how the following words have been used, then write sentences of your own using these words: strictly utilitarian (1.2); vicinity (1.4); elapse (1.5); tapping (1.5); apparatus (1.8); shoal (1.9); comparatively (1.9); emit vpn软件免费 (1.13); steer clear (11.13-14).
Sentence structure句子结构
ACombine the following sentences vpn免费 to make one complex statement out of each group．Make vpn软件免费 any changes you think necessary, but do not alter the sense of the original．Refer to the passage when you have finished the exercise:
1Not all sounds made by animals serve as language．We have only to turn to that vpn免费 extraordinary discovery vpn软件免费 of echolocation in vpn免费 bats．We can see a case in which the voice plays a strictly utilitarian role．(11.1-2)
2A sound can be made by tapping on the hull of ship．It will be reflected from the sea bottom．We can measure the time interval vpn免费下载 between the taps and the receipt of vpn软件免费 the echoes．The depth of the sea at that point can be calculated．(11.5-7)
3Every solid object will reflect a sound．This varies according to the size and nature of the object．(11.8-9)
4With experience, vpn免费下载 and with improved apparatus, it is now possible to locate a shoal．It is possible to tell if it is herring, cod, or other well-known fish, by the pattern of its echo．(11.10-12)
5A few years ago it was found that certain bats emit squeaks.
They received echoes．They could locate obstacles.
They could stear clear of obstacles．They could locate flying vpn免费 insects on which they fed．(11.13-14)
BWithout referring to the passage write three sentences indicating three different uses of vpn免费 the principle ofecho - location.
Key structures关键句型
ACompare these two sentences:
Instead of saying: If we wish to get a full appreciation of 免费vpn vpn免费下载 what this means we must turn first to some recent human inventions.
We can say: To get a full appreciation of what this 免费vpn means we must turn first to some recent human inventions．(1.3)
Complete the following sentences:
1To understand ______.
2To enjoy ______.
3To succeed _____.
BSupply a, an, or the where necessary in the following paragraph．Do not refer to the passage until you have finished the exercise:
Everyone knows that if he shouts in _____ vicinity of ______ wall or ________ mountainside, ___ echo will come back．______ further off this solid obstruction, ______ longer time will elapse for ___ return of ______ echo．_______ vpn软件免费 sound made by tapping on _____ hull of _____ ship will be reflected from ________ sea bottom, vpn免费 and by measuring _______ time interval between ________ taps and _______ receipt of ______ echoes _______ depth of _______ sea at that 免费vpn point can be calculated．Sowas born _______ echo - sounding apparatus, now in _____ general use in ______ ships．Every 免费vpn solid object will reflect ______ sound, varying according to vpn软件免费 _____ size and _____ nature of _____ object．_______ shoal of vpn软件免费 _______ fish will do this．So it vpn免费下载 is ________ comparatively simple step from locating ________ sea bottom to locating ______ vpn免费 shoal of _______ fish．(11.3-10)
CStudy the vpn免费下载 form vpn软件免费 of the verbs in italics in these sentences:
A sound made by tapping on the hull of a ship will be reflected from the sea bottom, and by measuring the time interval between the taps and the vpn免费 receipt of the echoes, the depth of the sea at that point can be calculated．(11.5-7) It has been found that certain bats emit squeaks and by receiving the echoes they can locate … obstacles．(11.13-14) Write three sentences in the same way using by vpn免费 followed by the -ing form of a verb．
DNote that the verb compared is followed by with in this sentence: Echo-location in bats is … vpn软件免费 compared with radar … (11.14-15)
Supply with, for, or to in the following sentences:
1I have been corresponding _____ him for many years.
2He was arrested and charged ______ murder.
3How much do you charge vpn软件免费 _______ this service?
4I can't provide you ________ all the things you need．
5We have provided _____ every emergency.
6Did you apply ________ vpn免费下载 that job?
7If you want a loan you should apply ______ the bank.
8He's much too quick for me．I just can't compete ______ him.
Special difficulties难点
AStudy the following pairs of words and then write sentences of your own to bring out the difference.
1sound (1.1) ---- echo (1.2)
Don't make a sound, any 免费vpn of you!
The echo of the gunfire died away, and vpn免费 the valley was quiet again.
2discovery (1.1) ---- invention (1.3)
The discovery of oil in Alaska was a boon to the economy.
The invention of personal computers was a very important event in the second half of the twentieth century.
3appreciation (1.3) ---- estimation
He lacks a realistic appreciation of the situation.
In vpn免费下载 my estimation, you'll need twelve rolls of wallpaper.
4obstruction (1.5) ---- obstacle (1.14)
There's an obstruction in 免费vpn the fuel pipe.
Fear of change 免费vpn is the greatest single obstacle to progress.
5steer (1.13) ---- drive
The captain steered his ship into the harbour.
It's quite possible to drive from Geneva to London in a day.
BSupply the missing words in these sentences:
1Not all the sounds made _______ animals serve as language．(1.1)
2This camera was made _________ Japan.
3Glass is made ____ sand and lime.
4This watch is made____ gold．
CExplain vpn软件免费 the word experience in these 免费vpn sentences:
1With experience it is now possible vpn免费下载 not only to locate a shoal but to 免费vpn tell if it is herring, cod, or other well-known fish.(11.10-11)
2He is a vpn软件免费 very experienced surgeon.
3It was one of the strangest experiences I have ever had．
DWhat does the phrase to tell if mean in this sentence:
It is now possible to tell if it is herring, cod, or other well-known fish．(11.10-11)
Write two sentences using to tell if.
ENote the spelling of echoes(1.12)．Write the plural of the following words: potato, piano, tomato, solo.
Multiple choice questions多项选择题
Choose the correct answers to the following questions.
Comprehension 理解
1What happens if you shout on a mountainside?
a．You will be able to measure vpn免费 distance.
b．Nothing.
c．It will take a long time for an echo to come back.
d．You vpn免费下载 will hear an echo.
2You can measure the depth of the sea by ____.
a．shouting so vpn免费下载 you get back an echo
b．tapping on the hull of a ship
c．working out how long it vpn免费 takes to get an echo from the sea bottom
d．calculating the reflection
3The echo-location principle means you can even ____.
a．locate and distinguish different species of fish
b．hear a fish's echo
c．improve the apparatus now in use
d．easily catch different species of 免费vpn fish
4Bats use echo-location to ____.
a．see where they're going
b．avoid bumping into things
c．avoid flying insects
d．emit squeaks
Structure句型
5Not ____sound made by animals serves as language．(l.1)
a．every
b．each
c．the whole
d．the entire
6We have only to turn to that extraordinary discovery of echo-location in bats to see a case ____the voice plays a strictly utilitarian role．(11.1-2)
a．which
b．where
c．when
d．why
7____ vpn免费下载 he shout in the vicinity of a wall, an echo will come back．(1.4)
a．Should
b．If
c．When
d．Though
8____ vpn免费下载 the echo-sounding apparatus was born．(11.7-8)
a．Such
b．The way
c．That's how
d．Like this
Vocabulary词汇
9The voice plays a strictly ____ role．(1.2)
a．secondary
b．important
c．usual
d．practical
10A sound made by ____ the hull of a ship - (11.5-6)
a．hitting
b．knocking
c．beating
d．bashing
11The sound varies ____the size and nature of the object．(11.8-9)
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