【正确答案】 B

【答案解析】[听力原文]
To quickly review the main points covered in Chapter 7, the most important part of the system of nerves is the brain. The brain controls most of the body activities. Messages between the brain and the spinal cord are carried by nerves, which are made up of special cells called nerve cells. Nerve cells are found in the brain, spinal cord, spinal nerves and in the organs we use to see, hear, smell, taste and touch. Nerve cells have long string-like fibres that carry messages. These fibres have branched ends to send and receive messages. Remember that nerve cells are so small that they cannot be seen without a microscope. But one fibre from the nerve cell may stretch as long as three feet. There are many kinds of nerve cells and this chapter deals mainly with three kinds. The sensory nerve cells carry messages of heat, light, sound, and pressure from the skin, muscles and organs inside the body. Motor nerve cells carry messages to the muscles and this causes the muscles to move. Connecting nerve cells go between the sensory nerve cells and the motor nerve cells to the muscles. All these different nerve cells help us see, hear, taste, smell and feel.

[分析] 主旨题。
本文从大脑的功能谈起，强调其中的重要组成物质神经细胞，然后对其性质及功能进行详尽的说明。由此可见，B项内容“神经细胞的功能与性质”与原文相符，是正确答案。
[解题关键] 根据文中关键词出现的频度可判断本文的中心。例如本文中短语nerve cells神经细胞频繁出现，暗示文章主题与此有关。

【正确答案】 D

【答案解析】[解析] 因果关系的找寻和判断。
根据题干中关键词nerve cells和fibres，可定位到相关信息处Nerve cells have long string-like fibres that carry messages即神经细胞有长长的线状纤维，可以传输信息。由此可判断D项内容与原文相符，为正确答案。
[解题关键] 通过句式特点推断出隐含的因果关系。本题原文中that引导的修饰fibres的定语从句实际上说明了神经细胞有线状纤维的原因。

【正确答案】 A

【答案解析】[解析] 隐含事实的找寻和判断。
根据原文These fibres have branched ends可知这些纤维有许多枝权，由此可推测这些纤维是stringy(多纤维的)；义根据But one fibre from the nerve cell may stretch as long as three feet可知神经细胞上的一条纤维可以拉长至三英尺长，由此可推断纤维是elongated (可拉长的)。因此A项内容与原文相符，是正确答案。
[解题关键] 理解原文中某些词语的替换性表达。

【正确答案】 C

【答案解析】[解析] 事实细节的找寻和判断。
文中讨论了三种神经细胞即the sensory nerve cells，motor nerve cells和connecting nerve cells，由此可见C的说法是正确的。
[解题关键] 注意分类提示的句子结构，如本题文．中使用了There are many kinds of nerve cells提示听者注意神经细胞的分类；this chapter deals mainly with three kinds 则明确告知分类的结果。

【正确答案】 B

【答案解析】[解析] 事实细节的找寻和判断。
根据题干中关键词sensory nerve cells 可找到相关信息The sensory nerve cells carry messages of heat，light，sound，and pressure from the skin，muscles and organs inside the body即感觉神经细胞将热、光、声音、压力等信息进行传送，由此可判断B“察觉、感知光”的说法与原文相符，是正确答案。
[解题关键] 根据关键词找到原文相关处，并将各选项内容与原文对照，即可找到正确答案。本题中，只有选项B出现与原文相符合的词语。