✨各位同学大家好！七选五一直是高考英语容易丢分的题型，很多同学读懂文章依旧选不对答案。今天我们用2017年高考英语七选五真题逐题拆解，理清句间逻辑，吃透做题套路。看完记得练习巩固，文末欢迎大家留言交流做题困惑！
一、原题呈现
Every animal sleeps, but the reason for this has remained foggy. When lab rats are not allowed to sleep, they die within a month. 71____
One idea is that sleep helps us strengthen new memories. 72____ We know that, while awake, fresh memories are recorded by reinforcing (加强)connections between brain cells, but the memory processes that take place while we sleep have been unclear.
Support is growing for a theory that sleep evolved so that connections between neurons(神经元)in the brain can be weakened overnight, making room for fresh memories to form the next day. 73____
Now we have the most direct evidence yet that he is right. 74____ The synapses in the mice taken at the end of a period of sleep were 18 per cent smaller than those taken before sleep, showing that the connections between neurons weaken while sleeping.
If Tononi’s theory is right, it would explain why, when we miss a night’s, we find it harder the next day to concentrate and learn new information-our brains may have smaller room for new experiences.
Their research also suggests how we may build lasting memories over time even though the synapses become thinner. The team discovered that some synapses seem to be protected and stayed the same size. 75____ “You keep what matters,”Tononi says.
A. We should also try to sleep well the night before.
B. It’s as if the brain is preserving its most important memories.
C. Similarly, when people go for a few days without sleeping, they get sick.
D. The processes take place to stop our brains becoming loaded with memories.
E. That’s why students do better in tests if they get a chance to sleep after learning.
F. “Sleep is the price we pay for learning,” says Giulio Tononi, who developed the idea.
G. Tononi’s team measured the size of these connections, or synapses, in the brains of 12 mice.
二、标准答案
71. C
72. E
73. F
74. G
75. B
三、逐题精讲（标注句间逻辑）
71题 答案：C
逻辑关系：类比关系（Similarly）
前文：实验室老鼠不睡觉，一个月内就会死亡。
C选项：同样地，人连续几天不睡觉，就会生病。
✅解析：利用 Similarly 形成动物实验→人类情况的类比，前后话题一致，论证缺少睡眠带来危害，完美承接上文。
72题 答案：E
逻辑关系：因果关系
前句观点：睡眠有助于巩固新记忆。
E选项：这就是为什么学生学习之后睡一觉，考试发挥更好。
✅解析： That’s why 是典型因果标志词，用学生实例印证“睡眠巩固记忆”这个理论，观点→举例论证。
73题 答案：F
逻辑关系：顺承引入人物
前文介绍新理论：睡眠弱化神经元连接，为新记忆腾出空间。
F选项：提出这个理论的Giulio Tononi指出：“睡眠是我们为学习付出的代价”。
✅解析：引出理论创始人Tononi，后文持续围绕此人的研究展开，实现人物铺垫，承上启下。
74题 答案：G
逻辑关系：总分关系
前句：现在我们拥有证明他理论正确最直接的证据。
G选项：Tononi团队测量了12只老鼠大脑中这些连接（突触）的大小。
✅解析：总起句说有证据，选项具体说明实验内容；后文紧接着描述老鼠实验的数据，前后紧密呼应。
75题 答案：B
逻辑关系：解释说明
前文：部分突触会受到保护，维持原有大小。后文引用话语：你留住重要的东西。
B选项：仿佛大脑在保存最重要的记忆。
✅解析：承接“部分突触保留不变”，进一步解释现象，和末尾“You keep what matters”形成语义呼应。
四、七选五通用做题方法
1. 通读首段，锁定文章主旨
快速把握主题（本文：睡眠与大脑记忆的科学理论），预判全文走向。
2. 抓逻辑信号词，判断句间关系
✅因果：that’s why, therefore, so
✅类比：similarly
✅转折：however, but, instead
✅递进：also, besides
✅例证：for example
3. 寻找词汇复现（解题核心技巧）
人名Tononi、synapses（突触）、memory这类名词反复出现，优先锁定含相同词汇的选项。
4. 瞻前顾后，不要只看前面一句话
设空答案必须同时匹配上文+下文，很多错误选项只能承接上文，和后文脱节。
5. 剩余选项代入验证
初选完成后，把选项放回原文通读，检查行文是否流畅。
五、重点词汇&短语汇总
1. foggy adj. 模糊的
2. strengthen new memories 巩固新记忆
3. reinforce connections 加强连接
4. evolve v. 进化；逐步形成
5. make room for… 为……腾出空间
6. concentrate v. 集中注意力
7. lasting memories 持久的记忆
8. synapse n. 突触
9. take place 发生
10. be loaded with 充满
这套2017高考七选五的逻辑大家看懂了吗？很多同学容易卡在73、74两道题，关键就是抓住人名Tononi这条线索！
你做七选五最容易栽在逻辑判断还是生词障碍？欢迎评论区留言！后续持续更新历年高考七选五真题解析，记得持续关注！
