1. A.G. Bell is unanimously considered to be the inventor of the telephone.
2. Nobody claims that the telephone was invented by A. Meucci.
3. A.M.Bell described the method of teaching deaf mutes to understand what other people were saying by the motion of their lips.
IV. .
1) Why did A.G. Bell become interested in acoustics?
a. He wanted to ameliorate the deafness of his mother.
b. He wanted to send long-distance signals.
2) What A.G. Bells invention is considered a predecessor of modern fiber systems?
a. The invention of a selenium cell.
b. The invention of the photophone transmission of sound on a beam of light.
V. . .
1) The latter published a lot of works on the subject, several of which are well known.
a. , .
b. , .
2) At Boston University he continued his research in the same field.
a. .
b. .
3) The range of Bells inventive genius is represented only in part by the eighteen patents.
a. .
b. , , .
VI. 3 5 A.G. Bell.
2
1
I. , . .
Example: These samples ( may / have to/ is to) be chosen deliberately. ( ) .
1. There are several ways a digital or analog signal (may/ must/ had better) be transmitted, including coaxial and fiber-optic cables.
2. For the first time, a signal (should/ have to/ could) be sent faster than any other mode of transportation.
3. Laser beams (have to/ may/ might) ultimately replace cables in telecommunications.
4. He (is not able/ mustnt/ couldnt) to complete this work himself.
II. , , Participle I, Participle II Gerund, , ( ). .
Example: There are several ways of obtaining this substance. (Gerund) .
1. Einstein didnt enjoy talking very much; in fact, he waited till he was three before he started to talk.
2. When studying elements Mendeleyev found that they could be divided into nine groups.
3. New technologies reduce the number of workers needed.
4. Some of the first communications satellites were designed to operate in a passive mode.
