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12.Cables are playing a very important part in today's communicates.They have been in use for over 100 years,but in the early times they caused a lot of difficulties for the forerunners.
Clearly,messages can be sent across the land by means of the
electric telegraph,but you cannot put up a line of telegraph posts across
the sea.Messages can be sent across the ocean by radio or by cable.
The cable lies on the sea bottom and it has to have very good insulation
(絕緣).If any part of it is weak,the water will get through and stop all signals.
The first cable under the sea was between England and France.It was laid in 1851.In 1851 engineers tried to lay cable across the Atlantic Ocean,but they met a lot of diffidently.Half way accrues the Atlantic the cable broke,and the ship that was laying it had to return.
Kelvin advised that another cable ought to be laid.It was mad mady and put on board a big ship.Kelvin and his friends traveled with it and after many days of hard work,they reached America without breaking the cable.Keivin himself sent the first message by cable from America in Britain.Unfortunately only 732 messages were sent through this cable before it broke.
The next cable was laid in 1866,and this time there were no problems.The ship that laid it was the Great Eastem,one of the strongest ships that time there were no problems.The ship that laid it was the Great Eastern,one of the strongest ships that have ever been built.On the other hand,it was driven by powerful engines and also by sails.
60.The undersea cable must be made strong enough to preventC.
A.fishes from eating it           
B.enemy stealing it
C.water getting through it        
D.others cutting it
61.The undersea cable that Kelvin and his friends laid was betweenB.
A.England and France              
B.America and England
C.America and France              
D.England and Britain
62.This passage mainly tells usC.
A.how Kelvin laid the cable       
B.how the scientists discovered the cable
C.the history of the cable in the world             
D.how do lay the cable in the sea.

分析 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了當今通信起著非常重要的作用的電纜的發(fā)展歷史,海底電纜的成功建立更是經歷了許多的困難,它必須堅固到水絕對不能進入,建立十分困難.

解答 60.C.細節(jié)理解題.根據文章第一段"If any part of it is weak,the water will get through and stop all signals"可知底電纜必須堅固到足以防止水進入它以免截斷信號;故選C.
61.B.細節(jié)理解題.根據文章第三段"Keivin himself sent the first message by cable from America in Britain"可知歐凱文和他的朋友交流的海底電纜是在英國和美國之間;故選B.
62.C.主旨大意題.通讀全文,可知文章主要講了當今通信起著非常重要的作用的電纜的發(fā)展歷史,海底電纜的成功建立更是經歷了許多的困難,它必須堅固到水絕對不能進入;故選C.

點評 考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據文章事實進行合乎邏輯的推理判斷.

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