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有用的知识才是真正的知识，知识的实用才有价值意义。智商的高低体现知识多少，情商的高低体现能力的大小。下面小编给大家分享一些高中英语选修八第二单元知识，希望能够帮助大家，欢迎阅读!
高中英语选修八第二单元知识1
课内高频词汇
1.differ(vi.) 不同;相异→difference(n.) 不同;差异→different(adj.) 不同的
2.exact(adj.) 精确的;准确的→exactly(adv.) 精确地;准确地
3.undertake(vt.) 着手;从事;承担→undertook(过去式)→undertaken (过去分词)→undertaking (n.)任务;项目;事业
4.regulation(n.) 规则;规章;法规→regular(adj.) 规则的;有规律的
5.cast(vt.) 扔;投;掷→cast(过去式/过去分词)
6.altogether(adv.) 总共;完全地
7.object(vi.) 反对;不赞成→objection(n.) 不赞成;反对;异议
8.moral(adj.) 道德(上)的;伦理的→morally(adv.) 道德上地;伦理上地
9.accumulate(vt. & vi.) 积累;聚积→accumulation(n.) 积累;聚积
10.assumption(n.) 假定;设想→assume(vt.) 假定;设想
11.shortly(adv.) 立刻;不久
12.retire(vi.) 退休;离开→retirement(n.) 退休，退职;退役→retired(adj.) 退休的;离职的
13.bother(vt.) 打扰(vi.) 操心(n.) 烦扰
14.resist(vt.) 抵抗;对抗→resistance(n.) 抵抗力;反抗→resistant(adj.) 有抵抗力的;耐……的
15.obtain(vt.) 获得;赢得→obtainable(adj.) 可获得的;可得到的
16.reason(n.) 理由;原因→reasonable(adj.) 合情理的;讲道理的;公道的→unreasonable(adj.)(反义词)不合情理的
17.fair(adj.) 公平的;适当的;合理的→fairness(n.) 公平→fairly(adv.) 公平地;相当地
高中英语选修八第二单元知识2
重点短语
1.pay_off得到好结果;取得成功;偿清
2.cast_down 沮丧;不愉快
3.have_a_great_impact_on 对……有重大影响
4.object_to 反对
5.in_favor_of 赞成;支持
6.owe..._to_ 把……归功于……
7.(be)_bound_to_(do) 一定或注定(做)……
8.strike...into_one's_heart 使……刻骨铭心
9.from_time_to_time 不时;偶尔
10.bring...back_to_life 使复生;使复活
11.in_vain 白费力气;枉费心机
12.in_good/poor_condition 状况很好(坏);情况很好(坏)
课内重点句型汇总
1.while表对比关系，“然而;可是”
Cloning plants is straightforward while(然而)cloning animals is verycomplicated.
2.当now，then位于句首，谓语是come，appear等时，主句完全倒装。(小伙伴们记得去回顾一下必修五的倒装句)that引导同位语从句
Then_came(传来)the disturbing news that Dolly had become seriously ill.
3.Theadvantage is that...“其优点是……”，that引导表语从句
The_advantage_is_that(优点是)if there is a new illness some of these animalsmay die, but others willsurvive and pass on the ability to resist that diseaseto the next generation.
4.based on...“建立在……的基础之上”，过去分词作状语
Based_on(建立在……基础之上)what we know now, you can not clone animals that havebeen extinct longer than10,000 years.
高中英语选修八第二单元知识3
单元语法
复习同位语
1概念
同位语是句子成分的一种，位于名词、代词后面，说明它们的性质和情况，它可以由名词、代词、名词性短语或从句充当。
The program is attractive. The program is WhereAre We Going, Dad.
→The program, Where Are We Going, Dad, is attractive.
同位语的表现形式
同位语除可以直接位于所修饰的名词、代词后外，也可以用“suchas, that is, of, or”等词引导。
The freezing temperature is the temperature at which water freezes underordinary pressure. Freezing point is that too.
→The freezing temperature, or freezing point,is the temperature at whichwater freezes under ordinary pressure.
2同位语从句
概念：一个句子在复合句中起到同位语的作用，对前面的名词进行解释说明。这个句子被称为同位语从句。
He told me the news—he would come home from abroad soon.
→He told me the news that he would come home from abroad soon.
3用法：同位语从句一般位于“fact,news, idea, truth, hope, belief, thought, doubt,question, promise,information”等抽象名词后，解释前面名词的具体含义。
When will he come back? I have no idea.
→I've no idea when he will come back.
4同位语从句连接词有“that,whether, who, which, what, when, where, why, how”等。
Should we continue to do the experiment?The problem has not beensolved.
→The problem whether we should continue to do the experiment has not beensolved.
5同位语从句与定语从句的区分：同位语从句所修饰的名词在从句中不作成分;定语从句所修饰的名词在从句中充当句子成分。
①Thenhe raised the question.
Wherewere they to get the machine needed?
→Thenhe raised the question where they wereto get the machineneeded.(同位语从句)
②Doyou know the place? He was born in the place.
→Doyou know the place where he was born?(定语从句)
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