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托福阅读句子插入题：lightning

2015-08-21 16:50:51来源：网络

　　【托福阅读题型：lightning句子插入题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之句子插入题

　　托福阅读句子插入题：lightning

　　The formation of the channel is initiated when electrons surge from the cloud base toward the ground. When a　stream of these negatively charged electrons comes within 100 meters of the ground it is met by a stream of positively　charged particles that comes up from the ground. When the negatively and positively charged streams meet, a complete　channel connecting the cloud and the ground is formed. The channel is only a few centimeters in diameter, but that is　wide enough for electrons to follow the channel to the ground in the visible form of a flash of lightning. The stream of　positive particles that meets the surge of electrons from the cloud often arises from a tall pointed structure such as a　metal flagpole or a tower.

　　That is why the subsequent lightning that follows the completed channel often strikes a tall structure. ■

　　Once a channel has been formed, it is usually used by several lightning discharges, each of them consisting of a　stream of electrons from the cloud meeting a stream of positive particles along the established path. ■ Sometimes,　however, a stream of electrons following an established channel is met by a positive stream making a new path up from　the ground. ■ The result is a forked lightning that strikes the ground in two places. ■(lightning)

　　Look at the four squares [■] that indicate where the following sentence could be added to the passage.

　　The descending stream of electrons divides at the point where the new positive-stream channel intersects the　　established path.

　　Where would the sentence best fit?

　　答案见下一页：

本文关键字: 托福阅读题型 托福阅读训练 句子插入题

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