高中必修一 · 第 8 课
二十一天 Twenty-One Days
同学们发起“二十一天习惯挑战”。有人说二十一天能养成一个习惯，也有人说朋友才是最好的闹钟。
📖 22 个单词📄 425词长文📝 6+13 题
1本课单词
2课文精读：二十一天 (Twenty-One Days · 约425词)
同学们发起“二十一天习惯挑战”。有人说二十一天能养成一个习惯，也有人说朋友才是最好的闹钟。 读课文，先自己理解，再点 🔊 听朗读。
Twenty-One Days
It all began with a bet. 'I bet you cannot go twenty-one days without your phone at the dinner table,' Jack said to Li Lei. Li Lei, who checked his phone at every meal, accepted without thinking. When the others heard about it, they wanted in. Soon, the whole group had personal challenges: Han Mei would exercise daily, Lily would read before bed, and Jack — who hated mornings — would get up at six.
一切始于一个赌约。“我打赌你做不到二十一天不在饭桌上碰手机，”Jack 对李雷说。每顿饭都要看手机的李雷想都没想就答应了。其他人听说后也要参加。很快，整个小组都有了各自的挑战：Han Mei 每天锻炼，Lily 睡前读书，而讨厌早起的 Jack 要六点起床。
The first week was brutal. Jack's alarm rang at six, and the world seemed to be made of concrete. Lily fell asleep after two pages. Han Mei's legs ached so much that she limped to class. And Li Lei, at dinner, found his hand reaching for his pocket again and again, as if his phone were calling him. 'Old habits are strong,' he groaned. 'You must be stronger,' Jack replied, and immediately fell asleep on the sofa.
第一周极其艰难。Jack 的闹钟六点响起，世界仿佛是用混凝土做的。Lily 读了两页就睡着了。Han Mei 腿疼得一瘸一拐去上课。李雷在饭桌上一次又一次把手伸进口袋，仿佛手机在召唤他。“旧习惯很顽固，”他呻吟道。“你必须更顽固，”Jack 回答，然后立刻在沙发上睡着了。
Cozy teacher noticed their red eyes and asked what was happening. When they explained, she smiled and offered a piece of advice: 'Do not rely on willpower alone. Change your environment. Put the phone in another room. Lay out your running shoes the night before. If you make the right choice easy, you will make it more often.' The students looked at one another — that made sense.
Cozy 老师注意到他们布满血丝的眼睛，问发生了什么。听完解释后，她微笑着给出建议：“不要只靠意志力。改变你的环境。把手机放在另一个房间。前一晚把跑鞋摆好。如果让正确的选择变得容易，你就会更常做出它。”学生们面面相觑——有道理。
The second week was easier. Jack discovered that sunrise was actually beautiful, Lily finished her first book of the year, and Han Mei could run a kilometre without stopping. They created a group chat called 'The 21 Club' where they posted their progress every day. 'We are the best alarm clock in the world,' Han Mei said. 'Friends who hold you accountable.'
第二周轻松多了。Jack 发现日出其实很美，Lily 读完了今年的第一本书，Han Mei 能一口气跑一公里了。他们建了一个叫“21 俱乐部”的群，每天打卡。“我们是世界上最好的闹钟，”Han Mei 说，“是让你负责的朋友们。”
On day twenty-one, they celebrated with a picnic. Jack, who had woken at six every single day, presented the sunrise photos he had taken. Li Lei showed his phone's screen-time report: dinner-table usage had dropped to zero. 'I feel different,' he said quietly. 'Lighter. More awake. I wish I had started this years ago.' Lily smiled: 'The best time to plant a tree was twenty years ago. The second best time is now.'
第二十一天，他们用野餐庆祝。每天六点起床的 Jack 展示了拍到的日出照片。李雷给大家看手机的屏幕使用时间报告：饭桌使用时间降到了零。“我感觉不一样了，”他轻声说，“更轻盈，更清醒。真希望我几年前就开始。”Lily 微笑：“种一棵树最好的时间是二十年前，其次是现在。”
That evening, Cozy teacher found the group's summary in the class newsletter and left a comment: 'Twenty-one days is not magic. It is twenty-one choices, made one after another. And every choice is a small vote for the person you want to become.' Li Lei saved the comment. The next morning, he was up before his alarm, and he realised with a smile: the habit had already chosen him back.
那天晚上，Cozy 老师在班级通讯里看到小组总结，留下一段评论：“二十一天不是魔法，而是二十一个接一个的选择。每个选择都是为你想要成为的人投出的一票。”李雷收藏了这段评论。第二天早上，他在闹钟响之前就醒了，并微笑着意识到：习惯已经选了他。
📖 读后理解（0/6）
1. What was the bet between Jack and Li Lei?
2. What was Jack's personal challenge?
3. What advice did Cozy teacher give?
4. What was the group chat called?
5. What did Li Lei show on day twenty-one?
6. What did Cozy teacher say twenty-one days is?
3语法小课堂：情态动词综合 & 非谓语动词深化
情态动词表建议与推测
should / ought to / must / may + do
You should lay out your running shoes the night before. （你应该前一晚摆好跑鞋。）
The habit must be practised every day. （习惯必须每天练习。）
He may be tired after the run. （跑完步他可能累了。）
⚠️ should 建议、must 必须、may/might 可能，语气不同。
非谓语动词深化
动名词作主语 / 不定式表目的 / 分词作状语
Getting up early is hard but rewarding. （早起很难但值得。）
To build a habit, you must repeat it daily. （要养成习惯，必须每天重复。）
Encouraged by friends, he kept going. （受到朋友鼓励，他继续坚持。）
⚠️ 动名词强调习惯性动作，不定式强调具体目的。
👨🏫Cozy 老师说：高中语法重在「在语境中理解」——多读课文里的例句，语法自然就活了。
4课后练习（0/13）
1. You ___ lay out your running shoes the night before.
2. The habit ___ be practised every day.
3. He ___ be tired after the run.
4. ___ up early is hard but rewarding.
5. ___ a habit, you must repeat it daily.
6. The bet was about going 21 days ___ the phone at dinner.
7. The first week was ___ .
8. Do not rely on ___ alone; change your environment.
9. Friends who hold you ___ are the best alarm clock.
10. The best time to plant a tree was 20 years ago; the second best time is ___ .
11. Every choice is a small ___ for the person you want to become.
12. Twenty-one days is twenty-one choices, made one ___ another.
13. I wish I ___ this years ago, said Li Lei.