Passage 3
Do you know the five main senses we have? They are touch, taste, sight, smell, and hearing. They are controlled by different parts of our brains. That's why we sometimes call the brain our built-in GPS. The brain helps our bodies work smoothly. Try this: close your eyes and touch your nose. It's easy, right? That's because our brains can receive messages about where our body parts are. We can also stand on one leg without falling down. If we lose our balance, our brains will give us orders to fix it.
. Tests show that people see spider pictures faster than flowers. Some researchers also found that people react(做出反应) to loud noises faster than to a friend's voice. Scientists aren't completely sure about the reasons. Some suggest that this skill might come from ancient times. Our ancestors were often faced with predators. So they had to protect themselves from dangerous animals like spiders and tigers, or they would lose their lives. Even today, we still jump at sudden noises or shadows(影子) in dark rooms.
Here is more about brains. Can you imagine seeing colours when you hear music, or tasting candy when you see the sunshine? It's called sense mixing. Scientists think this happens when different senses intermingle(相互交织). Another fact is that temperature sometimes influences our senses. Some people feel storms coming through knee pain, so we often joke that we're "human weather apps". Also, our brains are able to make adjustments(调整) to some senses. If someone can't see well, their hearing or touch might become stronger.
Though scientists have done much research on the brain, there's still a lot to do. Have you ever wondered why some people are better at sports? What's the secret to improving memory? Then it's time for you to start your discovery journey.
() 1.What do the two examples in the first paragraph show?
A. The brain helps our bodies work well.
B. Human brains are different.
C. Humans can touch their noses easily.
D. People have many living habits.
() 2.Which of the following can be put in ""?
A. It's fun to study our ancestors' life.
B. It's easy to learn about senses.
C. Animals help people in many ways.
D. The brain is also a life-saving hero.
() 3.Which animal in the following pictures is probably a "predator"?

() 4.According to Paragraph 3, what might happen if your senses mix?
A. You can tie your shoes without looking.
B. You taste sweetness when seeing an apple.
C. You jump when someone shouts suddenly.
D. You feel pain in your knees before the rain comes.
() 5.What is the purpose of writing the last paragraph?
A. To improve people's memory.
B. To encourage brain studies.
C. To show the value of our brains.
D. To admire scientists' efforts.

1.A 2.D 3.A 4.B 5.B

【分析】
这是一篇介绍人类大脑功能的科普说明文，解题时首先通读全文理清文章脉络：文章依次介绍了大脑调控身体感官、帮助人类规避危险、感官交叉、感官代偿等相关知识，最后号召大家探索大脑的未知领域。之后针对每道题，带着题干关键词返回原文定位对应段落和语句，结合上下文逻辑逐一比对选项，排除错误干扰项，选出最贴合原文的答案。
【解析】
1. 回原文第一段定位，段中先给出核心观点“The brain helps our bodies work smoothly.”，后续举“闭眼摸鼻子”“单腿站立不摔倒”两个例子，都是为了佐证大脑可以帮助人体正常顺畅运作。选项B文中未提及人类大脑的差异，选项C只是例子本身的表层内容，并非举例要说明的核心道理，选项D的“生活习惯”在第一段完全没有相关表述，因此答案选A。
2. 设空处位于第二段段首，需要选出能总领全段的主题句：第二段后文内容介绍大脑可以让人类快速识别蜘蛛、巨响这类危险信号，远古时期帮助人类躲避天敌保住性命，对应D选项“大脑也是拯救生命的英雄”可以完美统领全段内容。其余选项A“研究祖先生活很有趣”、B“了解感官很容易”、C“动物在很多方面帮助人类”都和后文核心内容不匹配，因此答案选D。
3. 根据第二段中“they had to protect themselves from dangerous animals like spiders and tigers”的表述，可知老虎属于人类需要躲避的predator（捕食者/危险天敌），对应题图中A是老虎，B是鹿、C是蝴蝶、D是绵羊都不属于危险的捕食者，因此答案选A。
4. 回第三段定位“sense mixing”的定义：文中描述它是“听到音乐时看到色彩，看到阳光时尝到糖果的味道”，也就是不同感官的体验互相交叉触发，B选项“看到苹果时尝到甜味”属于视觉触发味觉，完全符合感官混合的特征。选项A是大脑调控肢体动作的表现，选项C是人类对突发危险信号的反应，选项D是体感预判天气的表现，都不属于感官混合，因此答案选B。
5. 最后一段先说明目前人类对大脑的研究还有很多空白，最后发出号召邀请读者开启大脑相关的探索旅程，写作目的是鼓励大家开展对大脑的研究。选项A“提升记忆力”只是文中提到的待研究的问题之一，并非段落写作目的，选项C“展现大脑的价值”不是本段核心表达，选项D“钦佩科学家的付出”在本段没有相关表述，因此答案选B。
【答案】
1.A 2.D 3.A 4.B 5.B
【知识点】
阅读理解细节定位，说明文主旨推断，词义语境猜测
【点评】
本题属于初中阶段典型的科普类阅读题，考点覆盖细节理解、段落主旨句补全、生词词义推断、写作目的判断等多个常见阅读题型，既考查学生快速回文定位信息的能力，也要求学生具备基础的上下文逻辑推导能力，整体命题梯度合理，能有效检验学生的说明文阅读水平。
【难度系数】
0.7