2. 外语
  3. It is not widely known that______. The existence of electricity in the air has been known ______.

It is not widely known that______. The existence of electricity in the air has been known ______.

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问题 It is not widely known that______.
The existence of electricity in the air has been known ______.
选项 A、for hundreds .of years
B、for several years
C、recently
D、for thousands of years
答案A
解析 根据文章第四段第三句The existence of electricity in the air has been known for centuries．可以得知：人们知道空气中电的存在已经好几个世纪了。可以判断答案为[A]。
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