4．carry out 执行，实施

　　5．try out 测试，试验；参加选拔

　　6．in large quantities 大量地

　　7．due to 因为，由于

　　8．by accident 意外地

　　1．[教材原句]Not only has aspirin proved vital for reducing fever and helping stop pain, but there are also other things that aspirin can help with.

　　阿司匹林不仅被证明对于退烧、止痛必不可少，而且还有其他用途。

　　[句型点拨]not only ... but also ...连接两个并列分句。若not only放于句首，所在的分句要用部分倒装。

　　[佳句赏析]Not only did we lose all our money, but we also came close to losing our lives.

　　我们不仅把所有的钱弄丢了，而且差点丢了命。

　　2．[教材原句]If penicillin had not been available, many people would have died from sickness or even small wounds.

　　如果没有青霉素，很多人会死于疾病，甚至很小的伤口。

　　[句型点拨]虚拟语气。

　　[佳句赏析]If you had come ten minutes earlier, you would have known what we were talking about.

　　如果你早十分钟过来，你就会知道我们在谈论什么了。

　　3．[教材原句]Since it was abnormal for mould to be in that lab dish, something must have gone wrong.

　　对于在实验室里的那个碟子里的霉菌来说是不正常的，所以一定是某些东西变坏了。

　　[句型点拨]must have done"一定做了某事"。

　　[佳句赏析]He seems very nervous; something must have happened to him.

　　他看起来非常紧张，一定出什么事了。

　　1．(教材P18)Both of these medicines have saved millions of people's lives and have proved beneficial to mankind since they were invented.

　　自从问世以来这两种药已经挽救了成百上千万人的生命，而且也证明了对人类有益。

　　★beneficial adj.有益的，有用的

　　①It is said Yoga has a beneficial effect on a fine figure.

据说练瑜伽对改善身材有益。