三、阅读理解。
如何改善记忆力？请阅读下面短文，根据短文内容从每小题所给的A、B、C、D四个选项中选出最佳选项。
Ancient poems, English words, historical events ... you must have a lot to remember at school. What if you could have a photographic(过目不忘的) memory? Scientists have done many experiments to find ways to improve memory. Here are some tips based on their findings.
①
Scientists asked people to either ride a bike slowly for 90 minutes or do it really fast for 6 minutes. The results show that the short but intense(高强度的) exercise causes the brain to produce(产生) a chemical(化学物质), which helps people remember things quickly. The amount of it is the highest after 6 minutes of intense exercise. That's the time when you should get down to remembering things!
②
When you were a baby, you slept soundly in your mum's swaying(摇晃的) arms. Scientists have found that if we sleep in a bed that gently sways, we can get deeper sleep, which improves our memory as well. So maybe you should buy a swaying bed.
③
Emotions can affect your memory. The moment you become emotional, you can remember things very well. This is because a brain structure called the amygdala(杏仁核) is responsible(作为原因的) for processing both emotion and memory. The brain wants us to remember things that make us feel strong emotions. So next time you want to remember what you have learned, try to lift your mood(情绪) first. Then, open your book to go over the knowledge.
1. Match the headings with each part.
(Note: Two of them may not be used.) ()
a. Use your emotions
b. Take on new hobbies
c. Sleep on a swaying bed
d. Do some intense exercise
e. Develop good sleeping habits
A. ①－d, ②－c, ③－a
B. ①－c, ②－d, ③－e
C. ①－a, ②－b, ③－d
D. ①－d, ②－e, ③－b
2. What does the underlined word "it" in Paragraph 2 refer to? ()
A. The brain.
B. The memory.
C. The chemical.
D. The amygdala.
3. 提升题 What can we infer from the passage? ()
A. People should avoid getting excited while studying.
B. Strong emotions make it easier to remember things.
C. Sleeping on a swaying bed may harm your memory.
D. People can remember best after 90 minutes of slow exercise.

1. A
2. C
3. B

【分析】
1. 第1题是段落小标题匹配题，需分别提取①②③段的核心内容，对应选项中的小标题；
2. 第2题是代词指代题，需定位“it”所在句子，往前找前文提到的单数名词，确定指代对象；
3. 第3题是推理判断题，需将每个选项与原文细节逐一比对，排除错误选项，选出符合原文的答案。
【解析】
1. 第1题：
①段核心：提到“短时间高强度运动使大脑产生一种化学物质，6分钟高强度运动后该物质含量最高”，对应选项d（Do some intense exercise）；
②段核心：提到“睡在轻轻摇晃的床上能获得更深的睡眠，改善记忆”，对应选项c（Sleep on a swaying bed）；
③段核心：提到“情绪会影响记忆，强烈情绪下更容易记住事物”，对应选项a（Use your emotions）；
因此选A。
2. 第2题：
定位“it”所在句：“The results show that the short but intense exercise causes the brain to produce a chemical, which helps people remember things quickly. The amount of it is the highest after 6 minutes of intense exercise.” 此处“it”指代前文提到的单数名词“chemical”，故选C。
3. 第3题：
A选项：原文提到“情绪好时记忆效果好”，并非要避免兴奋，A错误；
B选项：对应原文“大脑会让我们记住带来强烈情绪的事物”，说明强烈情绪更容易记住东西，B正确；
C选项：原文提到摇晃的床能改善记忆，而非损害，C错误；
D选项：原文是6分钟高强度运动后化学物质最多，而非90分钟慢运动，D错误；
因此选B。
【答案】
1.A 2.C 3.B
【知识点】
英语阅读理解、段落主旨匹配、代词指代、推理判断
【点评】
本题为科普类英语阅读理解，围绕改善记忆力的方法展开，考查学生对段落核心、代词指代及细节推理的能力，需学生精准定位原文信息，逐一比对选项。
【难度系数】
0.6