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.

Which of the following claims about lightning strikes can be inferred from paragraph 5? 
A During a lightning strike the diameter of the channel the electrons follow is considerably enlarged beyond a few centimeters. 
B A building is unlikely to be hit by lightning unless it is at least 100 meters tall. 
C A building is hit by a lightning strike because the building itself has first determined the path the lightning then takes to it.
D The light of a lightning strike first appears at the point where the streams of negative and positive particles meet.

注意:
(1) 此題型屬於細節類題型, 因此於題幹中即出現某個明確之細節定位詞。
(2) 該題型乃對於原文細節資訊之正面提問 (題幹一般出現有true / support);因此, 此題型之方向與否定事實資訊題相反。
(3) 此題型疑問部分一般由特殊疑問詞：which / how / what / why… 引導, 因而該題型大致上就某細節資訊之具體“ 特性、原因、方式等” 出題。

Answer: 首先, 如同上課我們講解的技巧要領: 
1. 看題幹找關鍵詞:  Which of the following claims about lightning strikes can be inferred from paragraph 5? 
關鍵詞lightning strikes  立刻回原文定位: 
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.

2. Lightning 所在之句子整句詳讀, 發現其句首有 the channel , 此條路徑, 何路徑, 代表尚須往前一句再找, When the negatively and positively charged streams meet, a complete channel connecting the cloud and the ground is formed.

3. Channel 指的是”當正電荷與負電荷粒子流 stream 彼此相遇時, 就會形成一條雲與地面之通道.  因此 lightning 就是電子流經此通道 channel 所形成.
再者, 題目又有strike, 表示 lightning 閃電擊中, 再看下句, 果然論述了lightning strike 之原理, 必須先有條電子流 channel = path
(C) A building is hit by a lightning strike because the building itself has first determined the path the lightning then takes to it.
因此正確答案為C.