【正确答案】 B

【答案解析】[听力原文] Today, we will keep talking about the idea of a language evolving. Last week, l talked about how war changes a language because one culture can dominate another and infuse aspects of its language into a new language. Today, I will talk about another way a language can be changed. It is... can anyone guess? Yes, it's technology. My example will be, hmm, a cell phone. Cell phones have changed and are currently changing the way we communicate with each other. Only 50 years ago, phone conversations were considered private affairs. For example, if I was at your house, and your phone rang, I would leave the room so that you could have a private conversation. With cell phones, people have conversations everywhere, at restaurants, on dates, umm, even on public transportation you can see people chatting away. Now people are talking about what was considered private in public. We will talk about work, people we hate, our relationships, and plans in front of complete strangers. The things we now talk about on the phone would have been considered extremely rude to say in public 50 years ago. Back then, you would be slapped by someone for talking about your boyfriend or girlfriend or a party you went to the night before. Umm, what else? We are changing how we talk as well. We all get phone bills, so talking on the phone means you are using money. So, the faster you talk the less money you use. This means we often start and end our phone conversations quickly. Before, we would take our time on the phone, ask someone how they are doing, chit chat for a bit, and then get to the point. We would slowly end the conversation, often saying bye two or three times. Now, we just say the point then maybe a goodbye, and the conversation is over. That would have been so rude only years ago. What did the speaker talk about last week? 听力原文中提到Last week, I talked about how war changes a language because one culture can dominate another and infuse aspects of its language into a new language. 由此可知，上周该演讲者讲到了战争是如何改变一种语言的，故选B。

【正确答案】 A

【答案解析】[听力原文] What would the people living 50 years ago think of today's phone conversations? 听力原文中提到现今人们在公共场合聊的内容任以前看来都是比较私密的，后面对此进行了举例说明，提到我们现在在公共场合用电话淡论的内容在五十年前看来会是十分不礼貌的，由此可知，在50年前的人们看来，电话聊天是应该在私下进行的，故选A。

【正确答案】 D

【答案解析】[听力原文] Why do we often start and end our phone conversations quickly? 听力原文中提到we all get phone bills, so talking on the phone means you are using money. 指出电话通话需要花钱，随后说到我们说得越快，花的钱就越少，这就意味着我们要快速地开始和结束电话通话。由此可知，是出于省钱的原因，D项表述正确，故选D。