世界上60%以上的信件是用英语书写的，上两个世纪英国和美国在文化、经济、军事、政治和科学上的领先地位使得英语成为一种准国际语言。精品小编准备了高二下册英语第四单元知识点，希望你喜欢。
1. represent vt .象征；代表，表现，描绘，体现
【单词家族】representation n. 代表,代表权;代理人representive adj. 典型的,代表性的 n.典型,代表,代理人
1) represent to…向…表示;交涉
represent….as….把…描绘成
represent oneself as/ to be ….自称是…/声言…
represent sth to sb. 向某人说明某事
2)make representations to….与…交涉;向…提出抗议
辨析：represent；stand for；on behalf of
1) represent用来表示代表某人/某个团体/政府等，某种标志代表什么，某物表现的是什么或把某物描绘成什么。represent 表示形式上“代表”，实际上只起象征意义时可与stand for互换， represent也可表示实际“代表”某人或某组织参加某活动。
2) on behalf of 只能用作状语，表示“代表或代替某人做某事”。
3)stand for 常用来表示(字母、数字、符号)代表或象征什么。
2.curious adj好奇的,奇特的;稀奇古怪的,难以理解的
【单词家族】curiosity n. 好奇心,求知欲;奇物,珍品
1) be curious to do sth 极想做某事
be curious about stn对…感到好奇
be curious + that 从句 …很反常
2) out of curiosity. 出于好奇
meet/satisfy one’s curiosity. 满足某人好奇心
with curiosity= curiously 好奇地
辨析：curious; eager; anxious; worried
1) curious 对…好奇。
2)anxious着重“担心;焦急”;而eager表“期待”、“急于”或“进取的热情”。eager 和anxious 都有“渴望的，急于”的意思，但略有不同，anxious着重指焦急、着急、担心的心情，eager着重指对成功的期望或进取的热情。
但两者有时都可译作“急于”。习惯搭配：be anxious about“担心”， be eager for“渴望”。
3)worried作“担忧”时，与anxious基本相同。常用：be worried about…为…发愁/着急。
【直击高考】1.Don't be too ____ about things you are not supposed to know. (NMET/上海/1998)
A.strange B.amusing C.curious D.conscious
2. about wild plants that they decided to make a trip toMadagascarfor further research.( 05江苏)
A.So curious the couple was?
B.So curious were the couple?
C.How curious the couple were?
D.The couple was such curious
3. People have always been about exactly how life on earth began.( 10天津)
A. curious B. excited C. anxious D. careful
4. —Would you mind my coming over and having a look at your new garden? My little son’s curious about those roses you grow. 〖05湖北〗
3. approach接近,靠近;走近n.接近;方法;途径
at the approach of…在…快到的时候
an approach to 接近;…的方法/途径/态度
approach sth./ sb. 靠近;接近某物/人
make an approache to sb. 接近某人
an approach to the grammar 一本语法入门的书
all the approaches to a place 通往某地的所有途径
辨析：approach；way; means; method
四者都有“方式;方法;途径”之意，但approach侧重于接人待物或思考问题的方式;way为一般用语;means指可以得到结果的方法;method指有规律的、有条理的做法。
【思维拓展】1) 表示“做…的方法”常用固定搭配：
the approach to (doing) sth.
the way to do s th./ of (doing)sth.
the means of (doing) sth.
the method of (doing) sth
2) 与不同的介词搭配：with this method; in this way; by this means。
【直击高考】1.At the meeting they discussed three different ___ to the study of mathematics. (2006湖北)
A. approaches B. means C. methods D. ways
2. The system has been designed to give students quick and easy____ to the digital resources of the library.（2009浙江）
A. access B. passage C. way D. approach
3. the city center, we saw a stone statue of about 10 meters in height.(10上海)
A. Approaching B. Approached
C. To approach D. To be approached
4. Nine in ten parents said there were significant differences in their approach to educating their children compared with that of their parents. （2009江苏）
4. defend vt.保卫；保护defence n.防御；保卫;防护
defend...against... 保护……，防御……
defend...from(harm) 保护……不受(伤害)
in defence of …为了捍卫….
defend one's argument 为某人的论点辩护
in sb’s/ sth’s defence 替某人辩护/提某事辩解
defense works 防御工事，防御工程
a defense satellite 防御卫星
legal defence 正当防卫
辨析：defend, guard, protect
三者都有“保护”之意。
1) defend是普通用语，用在军事上，指，防御;保卫”，用于非军事意义时，指“保护;辩护”。defend常见的搭配为:to defend sb/sth against/from... ; defend oneslf 自卫
2) guard指“守卫;监视;戒备”，通常侧重指警惕性非常高地防 范或戒备潜在的危险。宾语后面可跟介词 against 或from;表示保护某人或某物免受某种威胁等，也可用作不及物动词，后面直接跟against,表示防范、防止某事的发生。
3) protect侧重表示提供各种保护手段或设施，以防遭受危险或伤害，或防御风雨、寒冬、烈日、疾病等的侵袭。
【即景活用】
(1)We should ______ the child ______ harm.
(2)Their duty is to ______the country______its enemies.
(3)It’s our duty to ________ our country when it is attacked by the enemy.
A.guard B.protect C.prevent D.defend
5. function n.作用；功能；职能v.起作用；运转
the function of the handle 把手的功用
abuse one’s functions 滥用职权
perform the function of …执行…的功能
6. ease n.安逸；舒适v.减轻痛苦/忧虑
at ease 舒适;快活;自由自在 At ease!稍息(口令)
feel/ be at ease 感到舒适而无忧虑;完全放松
with ease 容易的;无困难的
ease one’s pain 缓解疼痛
ease one’s mind 使某人安心
look at ease看上去心情放松
put/set sb. at one‘s ease 使某人放松、松弛
take one’s ease 休息，轻松一下
【即景活用】
(1)He passed the examination ____________.他轻松地通过了考试。
(2)I never feel completely _________ with him.我跟他在一起总感到不是很自在。
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