四六级

　　2017年12月英语六级考试复习模式已经开启，各位朋友是否有所准备？虽然现在距离12月还早，但是英语六级的复习可是得提上日程了呢，趁现在还早，时间充裕，我们可以不紧不慢的进行英语六级备考啦。下面是小编为大家提供的2017年下半年英语六级听力考试复习资料，一起看看吧！

点此下载六级听力练习.mp3

　　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.

　　原文与解析：

　　Ever lose your ability to taste during a cold, becauseyour nose is stuffed up? That's because the nose isintimately involved with taste. When you chew,flavor compounds from the food may enter the backof your mouth. And when you breathe out, you carrysome of those flavor compounds up into your nasalcavity.

　　"As children we basically learn, the first lesson of table manners is to keep the mouth closedwhile chewing, and you also want to breathe smoothly." Randy, a mechanical engineer at PennState said, (20) "I think this is not only because it's polite, but also because you can smell thefood 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 mixedwater with special particles and pumped it through the model, filming the results. (21) Theyfound that when you breathe in, that inward airflow actually forms a curtain at the back of yourmouth, blocking food particles from getting into the lungs, which is a good thing. And when youbreathe out, air swirls through that cavity in the back of the mouth, sweeping up those particlesand 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 andpuffing. Meaning if you're wolfing down your food, gasping for air, that breathing actuallydelivers more of those food molecules into your lungs and fewer into the nasal cavity. In otherwords, your mother was right all along: (22) keep your mouth shut and don't wolf down yourfood. 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?

　　【小题20】听力原文中提到 I think this is not onlybecause it's polite, but also because you can smell the food much better if you can breathesmoothly.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 thechances 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。

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