开学课堂英语四级考试阅读练习（41）_大学英语阅读

　　d.A few optical fibers can carry thousands of phone calls.

　　2.As it is used in the passage,the phrasefiber opticsmeans _____.

　　a.transmission of information by means of infra-red light signals aling a thin glass fiber.

　　b.material or substance formed from a mass of fibers.

　　c.a flexible fiber-optic instrument that is used to view objects

　　d.a composite material consisting of glass fibers in resin

　　3.Which of the following can not be inferred about fiber cables from the passage?

　　a.They carry light waves.

　　b.They can be used in many forms of communication.

　　c.They are better than copper wires.

　　d.They are shorter than copper wires.

　　4.You can infer from the passage that a cable is _____.

　　a.a group of wires or strands that are bundled together

　　b.a copper wire that is used to carry phone calls

　　c.a glass fiber that carrise coded bursts of light

　　d.a laser that changers electrical impulses into light

　　5.You can infer from the passage that the wordtransmit most nearly means _____.

　　a.carry from one place to another

　　b.pulse with light

　　c.operate quickly

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