题目内容
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解析:
(1) |
由“Scientists have developed glass fibres as thin as human hair which are designed to carry light signals.”可知。 |
(2) |
由“When the light reaches the other end, it is first changed into electrical signals, which are in turn converted(转变)into sound messages.”可知。 |
(3) |
由“…the new system was used successfully in an experiment in Chicago in 1977.”可知。 |
(4) |
由“…second, they cost less.”可知。 |
(5) |
由“Glass has many extraordinary qualities and it is frequently being used in new ways.”可知 |
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