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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