2. 外语
  3. According to the passage, people started to make glass ______. One of the extraordinary qualities of glass is that it can carry

According to the passage, people started to make glass ______. One of the extraordinary qualities of glass is that it can carry

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问题 According to the passage, people started to make glass ______.
One of the extraordinary qualities of glass is that it can carry ______.
选项 A、light signals
B、sound signals
C、electric signals
D、any signals
答案A
解析 见文章第二段第二句“Scientists have developed glass fibres as thin as human hair which are de signed to carry light signals”。
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