1、Unit 7 The seaLesson 4 Sea stories辅导与练习 构词法由一个词根加上前缀和（或）后缀构成另一个词。1、 前缀dis- agree 同意 disagree 不同意 appear 出现 disappear 消失 cover 覆盖 discover 发现un- able 能够 unable 不能 fair 公平的 unfair 不公平的 limited 有限的 unlimited 无限的 tie 系上 untie 解开im- possible 可能的 impossible 不可能的 patient 耐心的 impatient 不耐烦的non- stop 停止 non-
2、stop 不停的 smoker 吸烟者 non-smoker 不吸烟者mis- understand 理解 misunderstand 误解 lead 领导，引导 mislead 误导-ize/-ise apology 道歉 apologise 道歉 real 真实的 realize 实现-dom free 自由的 freedom 自由 wise 明智的 wisdom 智慧-th true 真实的 truth 真相 warm 温暖的 warmth 温暖-ful hope 希望 hopeful 有希望的 forget 遗忘 forgetful 健忘的-less home 家 homeless 无
3、家可归的 harm 危害 harmless 无害的-ive create 创造 creative 有创造性的 effect 效果 effective 有效的-ly bad 坏的 badly 坏，差 happy 高兴 happily 高兴地，幸福地1 Junk food may _great, but it is not good for your health. (taste, tasty)2 Havent I told you many times that you should not eat fruit that is not _? ( ripe, ripeness)3 It is ne
4、cessary to have a physical _every year. ( examine , examination)4 After a whole mornings sports activities, we need to _for the rest of the day.(fuel , refuel)5 Science is of great help in developing the _(economy, economic) 6 The new maglev train that connects the city of Shanghai with Pudong Airpo
5、rt is both fast and _ .(comfort, comfortable)7 Car drivers should always _their seat-belts. (fast, fasten)8 Most metals _electricity very well.(conduct , conductor )9 Many people have trouble in finding jobs, so that many of them become _(hope, hopeless) in life.10 Thanks to hard work, he _(success, succeed, successful)in working out the problem.Answers 1. taste 2. ripe 3. examination 4. refuel 5. economy 6. comfortable 7. fasten 8. conduct 9. hopeless 10. succeeded