公共英语考试

解析：The existence of electricity in the

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【单选题】The existence of electricity in the air has been known ______.


A．for hundreds .of years
B．for several years
C．recently
D．for thousands of years


网考网参考答案：A
网考网解析：
[解析] 细节题。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]。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>

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