文档介绍：新概念英语2第48课
本课内容
单词学****br/>课文逐句讲解
理解课文并回答问题
练****一般和特殊疑问句
课后****题详细讲解
New words and expressions 生词和短语
pull v. 拔
cotton wool 药棉
collect v. 搜集
collection n. 收藏品，收集品
nod v. 点头
meanwhile adv. 同时
Dentists always ask questions when it is impossible for you to answer. // My dentist had just pulled out one of my teeth and had told me to rest for a while.// I tried to say something, but my mouth was full of cotton wool.// He knew I collected match boxes and asked me whether my collection was growing.// He then asked me how my brother was and whether I liked my new job in London.// In answer to these questions I either nodded or made strange noises. // Meanwhile, my tongue was busy searching out the hole where the tooth had been.// I suddenly felt very worried, but could not say anything.// When the dentist at last removed the cotton wool from my mouth, I was able to tell him that he had pulled out the wrong tooth.
Comprehension questions
1 When do dentists always ask questions?
When it's impossible for us to answer.
2 Have you just had a tooth out?
Yes, I have.
3 Who pulled it out for you?
My dentist did.
4 What did he tell you to do afterwards?
To rest for a while.
5 Did you try to say something?
Yes, I did.
6 You couldn't, could you?
No, I couldn't.
7 Why couldn't you?
My mouth was full of cotton wool.
8 What was your tongue busy doing?
Searching out the hole where the tooth
had been.
9 How did you feel suddenly?
Very worried.
Dentists always ask questions when it is impossible for you to answer. 牙科医生们总是在你无法作出回答的时候向你提出问题。这里it是形式主语，真正的主语是to answer。
impossible通常不以人作主语，而以不定式或从句作主语
It is +adj+for/of sb+to do sth
It is+adj+that +句子
2. My dentist had just pulled out one of my teeth and had told me to rest for a while. pull做动词是表示“拖、拉、拔”的意思。
与之相反的动作就是push了，表示“推”。我们经常在门把手上看到这两个词，如果写着pull，就表示你拉门就开了。如果写着push，就表示推门门就开了。课文这里pull out表示“拔出”的意思。补充：pull