阅读“七选五”训练
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
In earliest times, men considered lightning to be one of the great mysteries of nature. 36 In reality, lightning is a flow of electricity formed high above the earth. A single flash of lightning 1.6 kilometers long has enough electricity to light one million light bulbs.
The American scientist and statesman, Benjamin Franklin, was the first to show the connection between electricity and lightning in 1752. 37 装置物) protects buildings from being damaged by lightning. This device (
