【正确答案】 C

【答案解析】[解析] 26-29
When you listen to a comedian cracking jokes on TV， do you have to work hard to pay attention?Of course not． (26)You simply sit back in a comfortable chair and enjoy the humor．It is easv，effortless，relaxing．
If you are 1ike many listeners，you assume that when you go into a room for a lecture or a speech on a difficult subject，you should be able to sit back and absorb the content just as easily as you grasp a comedian's jokes．This is a major misconception because the two situations are quite different．(26)Listening to light material requires only a modest amount of mental effort, while listening effectively to difficult material requires work．(27)You must be alert and energetic, giving total concentration to the speech,with your eyes on the speaker,your ears tuned in to the speaker's words,and your mind geared to receive the message．
According to Dr.Ralph Nichols，(28)who did pioneering work on listening skills at the University of Minnesota，(29)listening"is characterized by faster heart action,quicker circulation of the blood, and a small rise in body temperature"．If you tend to drift away mentally whenever a speaker begins to talk about unfamiliar or difficult material，try to break yourself of the habit．Vow to put as much energy as necessary into paying attention．
Q: What would people do when listening to jokes on TV?

[答案详解] 说话者说听电视上的笑话时，人都会靠在椅背上，非常轻松。下文说听轻松的内容时只需要投入少量的精力，电视上的笑话属于轻松内容，故选C)项。

【正确答案】 C

【答案解析】[解析]
Q: What is necessary in listening to a lecture or speech?

[答案详解] 说话者说在听演讲时必须集中精力，认真听演讲者的话，并且用心接收演讲者传达的信息，故选C)项。

【正确答案】 A

【答案解析】[解析]
Q: Who is Ralph Nichols?

[答案详解] 说话者谈到Ralph Nichols时使用了一个定语从句who did pioneering work on listening skills at the University of Minnesota，由此可知选A)项。

【正确答案】 D

【答案解析】[解析]
Q: According to Dr．Ralph Nichols，which is not involved in the listening?

[答案详解] 说话者提到，根据Ralph的研究，听别人讲话的时候，人的心跳加速，血液流动加快，体温轻微升高，D)项“呼吸更沉重”没有提到。