文档介绍：Unit 15-16, SBⅡ
重点词语:
1. solve the mystery 揭开迷团
2. would rather do … 宁愿做……
3. accept the invitation 接受邀请
4. after all 毕竟
5. call on 拜访(某人)
6. try on 试穿
7. day and night 日日夜夜
8. pay off 还清
9. at most 最多, 至多
10. be worth 值……
11. earn a lot of money 赚很多钱
12. act out 表演出来
13. come up with 想出, 找到
14. advantages and disadvantages 利弊
15. conduct a number of experiment 做了很多实验
16. get charged 充电
17. a great deal of 大量, 很多
18. fix…to… 把……固定在……
19. conduct the electricity 导电
20. sense of smell 嗅觉
21. end in a tie 以平手结束, 打平
22. in tears 泪流满面
23. test on 在……身上做试验
24. at least 至少
25. work with 起作用
26. there is no doubt 毫无疑问
难点讲解:
1. before
【用法一】prep.（时间）……以前
例1：He arrived there before 。
例2：A few minutes before the accident he called on 。
例3：Please come before 10 o’。
【用法二】prep. （位置）在……的前面
例1：He sat just before 。
例2：The prisoner was taken before the 。
【用法三】prep.（位次）先于，高于
例1：The English verb comes before the 。
例2：We should put the collective interests before our own personal 。
例3：Those with babies get on the bus before the oth-。
【用法四】conj. 在……以前
例1：I must finish my work before I go home.
我必须在回家这前做完工作。
例2：Before I came I to Shanghai, I had worked in Bei-jing for many 。
【用法五】conj. ……就……
例1：I had not waited long before he 。
例2：I’ ll do it now before I forget 。
例3：It wasn’t long before she came 。
【用法六】conj.……才……
例1：It will be long before we meet 。
例2：One must sow before one can 。
【用法七】adv. （常与完成时或never连用）以前，从前
例1：Have you ever heard of that before?你以前听说过那事吗？
例2：I have never met him 。
【相关链接】
1) before long