B．effect

　　C．cash

　　D．experience

　　解析：选D　作者母子帮助这位老人的事情对儿子来讲是一次难忘的经历，所以experience“经历”符合语境。

　　20．A.positive

　　B．energetic

　　C．special

　　D．normal

　　解析：选A　根据语境可知，帮助老人这件事让作者母子二人都感觉很好，所以positive“良好的，正面的”符合语境。

　　Ⅱ.语法填空

　　(2016·山西省考前质检)As a man was passing some elephants, he suddenly stopped, confused by the fact that these huge creatures were being held by only a small rope __1__ (tie) to their front leg. No chains, no cages. __2__was obvious that the elephants could, at any time, break __3__from their bonds but for some reason, they did not.

　　He saw a trainer nearby and asked why these animals just stood there and made no attempt __4__ (get) away. “Well，”__5__ trainer said, “when they are very young and much __6__ (small), we use the same size rope to tie them and, at that age, it’s enough to hold them. As they grow up, they are conditioned to believe the rope __7__ still hold them, so they never try to run free.”

　　The man was amazed. These animals could at any time escape from their bonds but __8__ they believed they couldn?t, they were stuck right where they were.

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