C
Here is a fun challenge: Get a lemon, peel it, and try to keep a straight face while you eat the whole thing. Could you do it? Probably not. You would scrunch(皱起) your face and close your eyes even before finishing the first bite. Do you know why?
Your tongue is packed with thousands of tiny taste buds(味蕾). They are called taste reporters, always ready to send messages to your brain. When sweet things like chocolate touch them, they smile. When salty chips arrive, they nod. But when sour things show up, they sound the alarm!
★ Scientists believe this “sour face” is actually your body’s ancient warning system. Imagine being a caveman(穴居人). You find some fruit and take a bite of it. If it’s very sour, it might mean the fruit isn’t ready to eat yet, or worse—it has gone bad! Your face scrunches up to say, “Stop! This might make you sick!” Of course, not all sour foods are bad for us. But some sour foods can make us sick—milk that has gone bad, for example. A scrunched face may be our body’s way to warn ourselves and others. It is trying to “protect” us from eating foods that might hurt us.
Guess what? If you love sour foods—like green apples, pickles, or lemonade—your face probably doesn’t scrunch as much. You’ve trained your brain to say, “I know this taste, and it’s OK!” That’s pretty amazing, right?
Want to see this in action? Set up a sour-tasting party with friends. Take photos and see who makes the funniest face. It’s science and lots of fun!
()61. What is “a straight face” closest in the meaning to?
A. A calm look.
B. An angry look.
C. A painful look.
D. An excited look.
()62. Why are taste buds called “reporters”?
A. They work with the tongue.
B. They get orders from the brain.
C. They explain why you make faces.
D. They send messages to the brain.
()63. Which of the following sentences can be put in ?
A. Let’s talk about taste buds.
B. Here’s the really cool part.
C. You’ve known why you hate sour foods.
D. Everyone has this sour face.
()64. What is Paragraph 4 mainly about?
A. How to train your brain to enjoy spicy foods.
B. What sour foods are.
C. When your face scrunches.
D. Why people who love sour foods may not scrunch their faces much.
()65. What would be the best title for the passage?
A. Sign of Sour: The Science Behind Scrunched Faces
B. Developed Taste: The Way of Getting Used to Sour
C. Ancient Alarm: The Body’s Warning System
D. From Cave to Party: The Story of a Sour Face

61.A 62.D 63.B 64.D 65.A

【分析】
本题为英语阅读理解题，需结合原文细节、逻辑关系及主旨逐一解答各小题：
1. 第61题：定位原文中“straight face”与“scrunch face”的对应关系，判断词义；
2. 第62题：定位原文中“taste reporters”的定义依据，匹配选项；
3. 第63题：分析空缺处前后文逻辑，选择承上启下的过渡句；
4. 第64题：概括第四段核心内容，匹配选项；
5. 第65题：梳理全文主旨，选择最贴合的标题。
【解析】
61题：原文第一段提到吃柠檬时要“keep a straight face”，但实际会“scrunch your face”，说明“straight face”与“皱脸”相反，是平静的表情，对应A选项。
62题：原文第二段明确指出味蕾被称为“taste reporters”是因为“always ready to send messages to your brain”，对应D选项。
63题：空缺前讲述酸的味道会触发身体警报，空缺后引出科学家对“酸脸”的科学解释，B选项“Here’s the really cool part”可承上启下，引出后续科学内容，符合逻辑。
64题：第四段围绕“喜欢酸食物的人不会皱脸”展开，解释了大脑适应酸味的原因，对应D选项。
65题：全文围绕“吃酸食物时皱脸的科学原理”展开，A选项“Sign of Sour: The Science Behind Scrunched Faces”最贴合主旨。
【答案】
61.A 62.D 63.B 64.D 65.A
【知识点】
英语阅读理解；细节理解；主旨大意
【点评】
本文是一篇科普类英语短文，围绕人体对酸味的反应展开，考查学生对阅读细节、段落逻辑、文章主旨的理解，需精准定位原文信息并分析逻辑关系，难度适中。
【难度系数】
0.5