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。今天小编给大家提供的是英语六级听力真题音频在线听第一套讲座3，希望对大家更好地进行2017年6月英语六级备考有帮助。

英语六级听力真题音频在线听第一套讲座3.mp3

　　Now listen to the following recording and answer questions 23 to 25

　　23

　　A.At the lower back of the brain.

　　B.At the bottom of the brain.

　　C.At the central section of the brain.

　　D.At the top of the brain.

　　24

　　A.Control regulation of the heart rhythms.

　　B.Control basic aspects of sound localization.

　　C.Control conscious thought and sensations.

　　D.Control complex voluntary motor functions.

　　25

　　A.Most parts of the brain.

　　B.The entire brain.

　　C.Only 10% of the brain.

　　D.A small fraction of the brain.

　　Morning, class. Today I've brought in a picture of the human brain, which we are going to look at and discuss in detail. The brain is like our command center for all our daily functions and allows us to cope with our environment. How we communicate with words, actions, thoughts, and feelings are all centered in the brain. Some researchers believe that the brain is so complex and mysterious that we will never be able to fully understand it. Some have even referred to it as a little black box like those found on a plane that contain all the critical and highly confidential information of the flight. It's easiest to think of the brain as three connected parts: the cerebrum, brainstem, and cerebellum.

　　(23) Let's start off with the brainstem, which is found at the bottom of the brain. The brainstem has an important role because it controls lots of critical functions including respiration, regulation of the heart rhythms, basic aspects of sound localization.

　　Next, we'll look at the second largest part of the brain—the cerebellum. It is located at the lower back of the head and is attached to the brainstem. (24) It is made up of two hemispheres and its functions are to control complex voluntary motor functions such as walking, balance and posture.

　　The third and largest part of our brain is the cerebrum. Its associations are conscious thought, movement and sensations such as touch, vision, hearing, judgment, reasoning, problem solving, and emotions.

　　The average weight of an adult human brain is anywhere between 1 and 1.5 kilograms. Some people say that we only use 10% of our brain, but this is just a myth. (25) In fact, we use our entire brain. That being said, we can claim that most people only use a very small fraction of the cognitive potential of their brain. Different cultures have used several methods to improve their cognitive potential such as reading, education, puzzle solving and critical thinking. I hope this brief introduction to the brain helps you understand the brain and its different functions.

　　23. Where is the brainstem located in the brain?

　　24. What is the function of the cerebellum?

　　25. To what extent do people use their brains?

　　参考答案：

　　【小题23】B

　　【小题24】D

　　【小题25】B

　　习题解析：

　　【小题23】听力原文中提到Let's start off with the brainstem, which is found at the bottom of the brain.明确指出脑干位于大脑的底部，故选B。

　　【小题24】听力原文在介绍 cerebellum（小脑）的位置之后，提到its functions are to control complex voluntary motor functions such as walking, balance and posture，即小脑的作用是控制复杂的随意运动功能，如行走、平衡和姿势等，故选D。

　　【小题25】题目考查大多数人对大脑的利用程度。听力原文中提到有人说我们仅用了大脑的10%，但这是没有根据的。随后明确提到我们使用整个大脑，故选项B为答案。虽然后文提到most people only use a very small fraction of the cognitive potential of their brain，但这里强调的是大多数人仅使用了大脑认知潜能的一小部分，而不是整个大脑，故排除选项D。

　　以上就是英语六级听力真题音频在线听第一套讲座3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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