四六级

　　英语六级听力改革后，考试题型变化较大，包括长对话、听力篇章和讲座，大家平时要有针对性的加强练习。本文是小编为大家提供的英语六级听力真题在线练习第5套讲座2，希望对大家更好地进行2017年6月英语六级备考有帮助。

英语六级听力真题在线练习第5套讲座2.mp3

　　Now listen to the following recording andanswer questions 20 to 22

　　20

　　A.It helps them digest the food better as children.

　　B.It only relates to the politeness of eating.

　　C.It helps them better smell the food.

　　D.It makes them chewing faster and more carefully.

　　21

　　A.When you breathe in, airflow blocks the food particles from entering the lungs.

　　B.When you breathe out, airflow delivers the food particles to the lungs.

　　C.When you breathe in, airflow delivers the food particles to the nasal cavity.

　　D.When you breathe out, airflow blocks the food particles from entering the nasal cavity.

　　22

　　A.Keep one's mouth shut.

　　B.Wolf down the food.

　　C.Breathe slowly when eating.

　　D.Chew carefully when eating.

　　Ever lose your ability to taste during a cold, because your nose is stuffed up? That's because the nose is intimately involved with taste. When you chew, flavor compounds from the food may enter the back of your mouth. And when you breathe out, you carry some of those flavor compounds up into your nasal cavity.

　　"As children we basically learn, the first lesson of table manners is to keep the mouth closed while chewing, and you also want to breathe smoothly." Randy, a mechanical engineer at Penn State said, (20) "I think this is not only because it's polite, but also because you can smell the food much better if you can breathe smoothly." Smell contributes to taste by this "backdoor". And it turns out our airways are particularly tuned to enhance that effect.

　　Randy and his colleagues 3D-printed a model of a woman's airway. To track airflow, they mixed water with special particles and pumped it through the model, filming the results. (21) They found that when you breathe in, that inward airflow actually forms a curtain at the back of your mouth, blocking food particles from getting into the lungs, which is a good thing. And when you breathe out, air swirls through that cavity in the back of the mouth, sweeping up those particles and delivering them right to the nasal cavity, where you can smell them.

　　There is a way to destroy this well-tuned system: the effect's mined if you're really huffing and puffing. Meaning if you're wolfing down your food, gasping for air, that breathing actually delivers more of those food molecules into your lungs and fewer into the nasal cavity. In other words, your mother was right all along: (22) keep your mouth shut and don't wolf down your food. It'll cut the chances of choking, and enhance the taste of the meal.

　　20. How does Randy explain children' first lesson of table manners?

　　21. What's the result of Randy's experiment?

　　22. What is the case that one is possible to get choked according to the lecture?

　　参考答案：

　　【小题20】C

　　【小题21】A

　　【小题22】B

　　习题解析：

　　【小题20】听力原文中提到 I think this is not only because it's polite, but also because you can smell the food much better if you can breathe smoothly.由此可知，Randy 认为孩提时代学到的餐桌礼仪——在咀嚼食物时嘴巴要紧闭，同时呼吸平稳——不仅仅是出于礼貌，也在于当你呼吸更顺畅的时候能更好地闻到食物的味道。故选项 C 为答案。选项 B 与听力原文内容相反，选项 A 和 D 未在听力原文中提及，均排除。

　　【小题21】听力原文提到 Randy 和他的同事通过 3 D 打印技术制作了一个呼吸道模型，以此来模拟、追踪气流流向，实验结果显示：吸气时，向内的气流在口腔内侧形成气幕，可以阻挡食物颗粒进人肺部;呼气时，气流在口腔内侧的凹处形成漩涡，卷起那些粒子送到鼻腔，从而使你闻到味道。由此可知，选项 A 符合实验结果描述，为答案。

　　【小题22】听力原文中提到 keep your mouth shut and don't wolf down your food. It'll cut the chances of choking，由此可知，嘴巴闭紧，别狼吞虎咽，就能减少噎住的风险，而反之即会增加噎住的风险，故选项 B 为答案。

　　以上就是英语六级听力真题在线练习第5套讲座2的全部内容，祝大家2017年6月英语六级考试顺利通关！

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