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最新版人教版八年级下册Unit2 趣味语境背单词 词汇精讲
一、趣味语境语篇
A School First Aid Day
Last Friday, our school held a first aid day. All the students learned how to deal with different illnesses and injuries, and it was really useful.
In the morning, the nurse came to our class. She told us what to do if someone has a stomachache, toothache or headache. She said if we have a sore throat, we should drink more hot water with honey. If we have a nosebleed, we should press the sides of our nose and put our head down. She also showed us how to take someone’s temperature to check if they have a fever.
Then, we learned about fire safety. The teacher said if a room is on fire, we should not panic. We should use a fire extinguisher and leave quickly. He also told us not to burn ourselves with hot water or fire. If someone gets bruised or bleeds, we should clean the wound and help them in time.
In the afternoon, we had a practice. A student pretended to have a toothache, and we learned to take him to the dentist. Another student pretended to fall and hurt his back, so we learned to help him with his backache. We also learned how to use X-rays to check for broken bones, which was very interesting.
At the end of the day, we all learned a lot. We know how to help ourselves and others when they are in pain. It was a great day, and we will never forget these important first aid skills.
二、重点词汇讲解（词根词缀 + 词源故事）
1. 核心名词（Unit 2 教材重点，贴合健康 / 急救话题）
(1) stomachache / st m ke k/n. 胃痛；肚子疼
词根词缀：stomach（胃）+ ache（痛）→ 胃痛
词源故事：ache 源自古英语 ce，原指 “持续的疼痛”，与身体部位名词组合，是描述身体疼痛的固定构词法。
搭配：have a stomachache（胃痛）；a bad stomachache（严重胃痛）
例句：I have a stomachache because I ate too much ice cream.
(2) headache / hede k/n. 头痛
词根词缀：head（头）+ ache（痛）→ 头痛
词源故事：同stomachache，ache 为 “疼痛” 词根，为日常常用疼痛词汇。
搭配：have a headache（头痛）；a terrible headache（剧烈头痛）
例句：She has a headache after studying for a long time.
(3) toothache / tu θe k/n. 牙痛
词根词缀：tooth（牙齿）+ ache（痛）→ 牙痛
词源故事：ache 为 “疼痛” 词根，tooth 复数为 teeth，toothache复数为 toothaches。
搭配：have a toothache（牙痛）；go to the dentist for a toothache（因牙痛看牙医）
例句：My brother has a toothache, so he can’t eat anything sweet.
(4) backache / b ke k/n. 背痛；腰痛
词根词缀：back（背）+ ache（痛）→ 背痛
词源故事：ache 为 “疼痛” 词根，贴合急救场景常用词汇。
搭配：have a backache（背痛）；a bad backache（严重背痛）
例句：My grandpa has a backache, so he can’t carry heavy things.
(5) fever / fi v (r)/n. 发烧
词根词缀：fever源自拉丁语 febris，可联想 feverish（发烧的），-ish 表 “具有… 性质的”。
词源故事：原指 “身体发热的状态”，为描述疾病的核心词汇。
搭配：have a fever（发烧）；a high fever（高烧）
例句：Take your temperature to see if you have a fever.
(6) illness / ln s/n. 疾病
词根词缀：ill（生病的）+ -ness（名词后缀，表状态）→ illness
词源故事：-ness 为常用名词后缀，可将形容词转化为名词。
搭配：different illnesses（不同的疾病）；a serious illness（严重的疾病）
例句：We should learn to protect ourselves from different illnesses.
(7) first aid 急救
词源故事：first（第一）+ aid（援助）→ 第一时间的援助→first aid
用法：固定名词短语，不可数；作定语用first aid，如first aid skills（急救技能）。
例句：We learned first aid skills at school last Friday.
2. 核心动词（Unit 2 教材重点，贴合急救 / 健康场景）
(1) suffer / s f (r)/v. 受苦；遭受
词根词缀：suffer源自拉丁语 subferre（sub - 在… 下 + ferre 承受）→ 受苦、遭受
词源故事：原指 “承受痛苦”，固定搭配suffer from（受… 折磨）。
搭配：suffer from（受… 折磨）；suffer pain（承受痛苦）
例句：My grandma suffers from backache every winter.
(2) press /pres/v. 压；按
词根词缀：press源自拉丁语 premere（压），可联想 pressure（压力）。
词源故事：原指 “用手按压”，是急救中处理鼻出血的核心动作。
搭配：press the nose（按压鼻子）；press the button（按按钮）
例句：If you have a nosebleed, you should press the sides of your nose.
(3) avoid / v d/v. 避免；防止
词根词缀：avoid源自拉丁语 evitare（e - 出 + vitare 避开）→ 避开、避免
词源故事：原指 “使某物空出、避开”，是描述预防疾病 / 伤害的核心动词。
搭配：avoid doing sth.（避免做某事）；avoid illness（避免疾病）
例句：We should wash our hands often to avoid illness.
(4) check /t ek/v. 检查；查明
词根词缀：check源自拉丁语 checkare，可联想 check-up（体检）。
词源故事：原指 “做标记核对”，后泛指 “检查、查明”。
搭配：check one’s temperature（量体温）；check the wound（检查伤口）
例句：The nurse checked my temperature to see if I had a fever.
3. 核心形容词 & 副词（Unit 2 教材重点，贴合语境）
(1) sore /s (r)/adj. 疼痛的；酸痛的
词根词缀：sore源自古英语 sār，无复杂词根。
词源故事：专门用于描述身体部位的酸痛、肿痛，与 ache（持续疼痛）区分。
搭配：sore throat（喉咙痛）；sore back（背痛）
例句：I have a sore throat, so I can’t speak loudly.
(2) careless / ke l s/adj. 不小心的；粗心的
词根词缀：care（小心）+ -less（否定后缀）→ careless
词源故事：-less 表 “无… 的”，可举一反三：homeless, helpless。
搭配：be careless with（对… 粗心）；a careless mistake（粗心的错误）
例句：Be careful not to be careless with fire, or you may get hurt.
(3) harmful / hɑ mfl/adj. 有害的
词根词缀：harm（伤害）+ -ful（形容词后缀）→ harmful
词源故事：-ful 表 “充满… 的”，与 - less 形成对比。
搭配：be harmful to（对… 有害）；harmful gas（有害气体）
例句：Smoking is harmful to our health.
(4) luckily / l k li/adv. 幸运地
词根词缀：luck（运气）+ -y + -ly → luckily
词源故事：-ly 为副词后缀，可举一反三：sadly, badly。
用法：置于句首，修饰整个句子，表 “幸运的是”。
例句：Luckily, no one got hurt in the fire.
4. 核心短语（Unit 2 教材重点，贴合急救场景）
(1) suffer from 受苦；受折磨
用法：后接疾病 / 痛苦，表 “受… 折磨”。
例句：Many people suffer from backache in winter.
(2) on fire 着火；起火
用法：表 “处于着火的状态”。
例句：If a room is on fire, you should leave quickly.
(3) stop ... from doing 防止……；阻止……
用法：stop sb./sth. from doing sth. 阻止某人 / 某物做某事。
例句：We should stop the virus from making us ill.
三、巩固练习
1. —I have a bad ______. I can’t eat anything.—You should go to the dentist.
A. stomachache B. toothache C. headache D. backache 答案：B
2. —What should I do if I have a nosebleed —You should ______ the sides of your nose and put your head down.
A. press B. hit C. burn D. check 答案：A
3. —Smoking is ______ to our health. We should keep away from it.
A. helpful B. harmful C. careful D. careless答案：B
4. —______, no one got hurt in the accident.—That’s great!
A. Sadly B. Luckily C. Badly D. Carelessly答案：B
5. —We should wash our hands often to ______ illness.—Yes, it’s a good way to keep healthy.
A. avoid B. suffer C. catch D. check答案：A
四、小试牛刀
一、单项选择（基础，侧重教材核心词汇）
1. I have a ______. I should go to the dentist.
A. stomachache B. toothache C. headache D. backache
2. If you have a fever, you should take your ______.
A. temperature B. illness C. pain D. gas
3. We should learn ______ skills to help others.
A. first aid B. on fire C. suffer from D. stop from
4. Smoking is ______ to our health.
A. helpful B. harmful C. careful D. careless
5. If you have a nosebleed, you should ______ your nose.
A. hit B. press C. burn D. check
二、单项选择（中档，侧重短语 & 语境运用）
1. My grandpa ______ backache every winter.
A. suffers from B. checks C. avoids D. presses
2. ______, I didn’t get hurt in the accident.
A. Sadly B. Luckily C. Badly D. Carelessly
3. We should ______ eating too much junk food to keep healthy.
A. avoid B. suffer C. catch D. check
4. If a room is ______, you should leave quickly.
A. on fire B. in fire C. with fire D. at fire
5. We should ______ the virus ______ making us ill.
A. stop; from B. stop; to C. keep; from D. keep; to
三、用所给词的适当形式填空
I have a __________(toothache). I need to see a dentist.
Smoking is_______(harm) to our health.
__________(luck), no one got hurt in the fire.
We should avoid _________(eat)too much ice cream.
My brother has a___________(stomach) because he ate too much.
四、根据汉语完成句子
我头痛。I have a ________.
我们应该学习急救技能。We should learn_______ _______ skills.
吸烟对我们的健康有害。Smoking ____ _____ ______our health.
我奶奶冬天受背痛的折磨。My grandma ______ _______backache in winter.
幸运的是，没有人受伤。_________, no one got hurt.
答案与详细解析
一、基础单选
B 解析：考查toothache（牙痛），结合 “看牙医” 语境，B 正确。
A 解析：考查temperature（体温），固定搭配 take one’s temperature（量体温）。
A 解析：考查first aid（急救），first aid skills（急救技能）。
B 解析：考查harmful（有害的），固定搭配 be harmful to。
B 解析：考查press（压、按），鼻出血急救正确操作。
二、中档单选
A 解析：考查suffer from（受… 折磨），suffer from backache。
B 解析：考查Luckily（幸运地），句首修饰整句。
A 解析：考查avoid（避免），avoid doing sth.。
A 解析：考查on fire（着火），固定搭配。
A 解析：考查stop…from doing（阻止… 做某事）。
三、词形填空
toothache 解析：固定搭配 have a toothache。
harmful 解析：be harmful to 对… 有害。
Luckily 解析：句首首字母大写，修饰整句。
eating 解析：avoid doing sth. 避免做某事。
stomachache 解析：have a stomachache 胃痛。
四、完成句子
headache 解析：have a headache 头痛。
first aid 解析：first aid skills 急救技能。
is harmful to 解析：主语 smoking 单数，用 is。
suffers from 解析：主语 my grandma 为三单，用suffers from。
Luckily 解析：句首首字母大写。

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