下列变异中，属于遗传物质改变引起的是（    ）

阅读短文，回答问题

One afternoon, Mrs. Green’s husband wanted to catch the 3: 30 flight to London to have an important meeting. She was very surprised when he telephoned her at     5 o’clock and said that he was still at the airport.

“What happened to you? ” asked Mrs. Green.

“Well, ” said Mr. Green, “Everything was going fine. I got my ticket, checked my bag and waited in line. I walked across the runway(跑道) to the airplane and I saw my friend Jack Scott, who was an airplane engineer. I shouted to him and a policeman caught me. ”

“Why did he catch you? ”

“I don’t know, ” said Mr. Green, “As soon as he heard my shout, he ran towards me and caught me. ”

“What did you shout to your friend? ”

“All I said was ‘Hi，Jack’. You know that’s the usual way we say hello to our friends. ”

“But you don’t know the sentence ‘Hi, Jack’ also means to take control(控制) of a plane by force(武力). ”

朋友之间无所用心的闲谈，如果两人的见识相当，而又彼此欣赏，那真是最快意的事了；                    。真正的知己，就算是默默相对，无声也胜似有声。

①要紧的是双方的境界能够交接，倒不一定两人都要有口才，

②如果双方的见识悬殊，那就好像下棋让子，玩得总是不畅。

③甚至也不必都健谈，而最宜一个健谈，一个善听，

④谈话的可贵之处就在于共鸣，更在于默契。

⑤因为口才宜于应敌，却不宜用来待友。

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