1道真题教会你「关键词定位法」，30秒锁定答案
七选五是很多同学的中考失分重灾区，总觉得“凭感觉选”、“错一个连错一串”。其实七选五所有答案，都藏在原文的关键词和逻辑词里。
今天用上海这道超经典的中考真题，手把手教你「关键词定位法」，看完就能直接套用在所有七选五题目上。
真题原题
B) 请先阅读下面短文，掌握其大意，然后根据短文内容从下面方框内的七个选项中选择五个还原到文中，使短文意思通顺、结构完整。一空一句。
At Shanghai No. 15 Junior High School, there is a special fish pond (池塘) that many students love. It is in the middle of the school buildings. Everyday, students run to the pond to feed the fish.
73. ______ Five years ago, the school made one that looked like the moon. It was about 80 square meters. To their surprise, over 100 fish died.
The students felt very sad and wanted to help. 74. ______ The school also asked Professor Cheng Shuiping from Tongji University for help.
Cheng found the water was too dirty for the fish. 75. ______ He made a "wetland system (湿地系统)" using glass boxes. The water goes into the boxes, gets cleaned, and then goes back to the pond. Students also grew flowers like iris (鸢尾花) to help clean the water. 76. ______
"Will the water in the man-made lake get dirty in the future?" "When do we need to change the water?" Some students asked the teacher these new questions.
The school saw how curious the students were. 77. ______ Now, the pond is not just a fun place—it's also a place for learning and sharing new ideas.
选项
A. So he had an idea.
B. But the pond was not always this lovely.
C. They looked for answers on the Internet.
D. And the pond became a great success at first.
E. However, he didn't find good ways to solve the problem.
F. Now, the pond is clean, and even baby fish have been born.
G. So it started a new project called "Man-made Wetlands" to help them learn more.
逐题拆解（★ 标注所有得分关键词）
73题 答案：B
✅ 空格前原文定位：
★ 上一段Everyday, students run to the pond to feed the fish.
（讲现在的池塘：学生每天都去喂鱼，很美好）
✅ 空格后原文定位：
★ Five years ago, ... over 100 fish died.
（讲五年前的池塘：刚建好就死了100多条鱼，很糟糕）
✅ 逻辑分析：
前后是今昔对比+转折关系，选项里只有B带转折词 ★ But，完美衔接“现在好→过去差”的逻辑。
74题 答案：C
✅ 空格前原文定位：
★ The students felt very sad and wanted to help.
（讲学生的行动：鱼死了，学生想帮忙）
✅ 空格后原文定位：
The school ★ also asked Professor Cheng for help.
（讲学校的行动：学校也请了教授帮忙）
✅ 逻辑分析：
关键词 ★ also（也） 说明：前后是同类动作的并列——先有学生的帮忙，再有学校的帮忙。学生能做的最直接的事，就是C选项“他们在网上找答案”。
75题 答案：A
✅ 空格前原文定位：
★ Cheng found the water was too dirty for the fish.
（讲教授发现问题：水太脏，鱼活不了）
✅ 空格后原文定位：
★ He made a "wetland system" using glass boxes.
（讲教授解决问题：他做了一个湿地系统）
✅ 逻辑分析：
前后是因果顺承关系：发现问题 → 有了想法 → 动手解决。中间过渡句就是A选项“所以他有了一个主意”。
76题 答案：F
✅ 空格前原文定位：
... to help ★ clean the water.
（讲采取的措施：建湿地、种鸢尾花，目的是净化水）
✅ 逻辑分析：
措施之后必然是结果。原文说“净化水”，结果就是“水变干净了”。F选项里的 ★ the pond is clean 和原文的 ★ clean the water 是100%同义替换，直接锁定答案。
77题 答案：G
✅ 空格前原文定位：
The school saw how ★ curious the students were.
（讲学校看到的现象：学生对池塘的问题很好奇）
✅ 空格后原文定位：
... it's also a place for ★ learning and sharing new ideas.
（讲最终结果：池塘变成了学习的地方）
✅ 逻辑分析：
前后是因果关系：学生好奇 → 学校推出学习项目 → 池塘成了学习场所。G选项里的 ★ learn more 完美衔接了前面的“curious”和后面的“learning”，双重锁定答案。
七选五通用满分三步法（所有题目通用）
1. 先看选项，圈出逻辑词：but / so / also / however 这些词是送分题，直接对应原文逻辑
2. 再看空格前后，圈出关键词：时间词、名词、动词、同义替换词
3. 最后匹配，先做简单题：先把有明显逻辑词的题做了，剩下的用排除法
