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 第二段第三行……which are designed to carry light signals．被用来携带光子信号。
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