4. How many ways can HIV spread?
1) contact with infected blood 2) mother-to-child 3) sex
5. Who is most likely to become infected? Anyone can become infected with HIV. HIV is transmitted sexually or through drug use by contaminated blood.
amphi- amphibian两栖动物
bi- bilingual双语的 di- dialogue \ dioxide \

twi- two twilight黎明；黄昏

一半


demi- demigod
hemi- hemisphere quasi- half quasi-official半官方的 para- half paramilitary准军事性的 semi- half semicircle半圆
1. What is AIDS?
Acquired Immunodeficiency Syndrome (后天性免疫缺陷综合症)
It is a disease that limits the body’s ability to fight infection. A person with AIDS has a very weak immune system, turning normally mild or rare diseases into potentially fatal conditions.

out- = out outdoor户外\ outflow流出 para (pari-)- = around, near parasite寄生虫\ pericardial心脏周围的 per- = through perceive post- = after postwar战后\ posterity后代 pre- = before prewar战前 \ prehistory史前 pro- = forward protrude伸出 \ progress前进 re- = back recall回忆 \ retell复述 retro- = back retrogress退步 \ retrograde倒退 sub- = under subway地铁\ submarine海面以下的 super- = above superstructure上层建筑 \superficial表面的 sur- = over surface表面 \ surmount攀登上山 trans- = across transatlantic横越大西洋的 \ transport运输 under- = under underground地下的 \underwear内衣 ultra- = beyond ultraviolet紫外线


IV. 具有地点、方向意义（包括上下、前后、来回、内外）的前缀有：
ab- = away from abnormal
circum- = around circumstance \ circumscribe com- = with, together committee
II. Movie ＆ Discussion
Words to Conquer
counselor congratulation fired sue representation 律师；法律顾问 祝贺；恭喜 被解雇的 控告；起诉 代表；代理
Reaction to AIDS
Pathology
Pray for HIV positive

sur- surface表面 \ surplus多余的 un- unreal虚假的\ unconditional无条件的\ unjust不公正的 \ unchanged未改变的\ unlock开锁\ unearth出土 vice- vice-president副总统 / vice- chairman副主席 III.具有时间意义的前缀有： ante- = before : antecedent前事 pre post-
2. What is HIV?
Human Immunodeficiency Virus (人类免疫缺陷病毒)
AIDS is different from HIV in that the former usually causes death while HIV may lead to AIDS.
3. What do you know about World AIDS Day? December,1st was established as World AIDS Day in 1988. It is the only international day of coordinate action (协调行动) against AIDS.
Discuss in Pairs
kiss share a book
hug
dance together
share a shaver
swim in the pool sit side by side
shake hands
英语构词法知识——前缀

词缀分为前缀和后缀两种。在大多数情况下，前缀往往改变词根 的词义，而后缀更多改变的是原词根的词性。结合阅读实践过程 中的实际用途，根据前缀的不同作用，把前缀分为：加强意义；否定 和肯定意义；数量意义等几类。 I. 具有加强的常用前缀有(包括改变词性的使成性前缀)：这一类前 缀中有的仅仅加强词根的意义，如attract；有的使成性前缀则改变 词根的词性，如assure则由原来的形容词sure加强转化而来。 a- (变体有：ac- , ad- ,af- , ag- , an- , ap , ar- , at- ， 都是在原来的词根前面添加字母a或者再加上词根原来的首字母)， aloud大声地\ account叙述 \ affirm申明\ aggrieve使苦恼 \ announce宣布\ appraise赞扬\ arrange安排\ assure使安心\ attract吸引



re- reclaim收回\ reverse反转的
retro- retrogress倒退 sub- subway地铁 \ subsonic亚音速的 \ subhead副标题 super- (supra-) superpower超级大国\ supersensitive过度敏感\ supranational超国家的



be- befall降临\ bethink思考 co- (变体有com- \ con- \ cor- )，commemorate纪念\ condense压缩


de- delimit界定\ design设计
e- (变体有ef - \ em- \ en- \ex- )evaluate评价 \ embody 体现 \ enchain用 锁住 i- (变体有il- \ im- \ in- )，例如：illuminate照亮\ illustrate阐 明\ impulse冲动\ inflame着火




V. 具有数量意义的有：
一 全部 holo- holography全息照片 mono- monoxide一氧化物 \ monotone单调 pan- Pan- American泛美的 omni- omnipresent无所不在的 \ omnipotent全能的 uni- unicycle 二
Discuss in Pairs
＊Have you ever met a pቤተ መጻሕፍቲ ባይዱtient of AIDS?
＊What will you call to mind when talking about AIDS?
＊Choose one of the following to do when being with an AIDS patient. Put them in an order from the first to the last according to your will:


de- = down from deceit
dis- = away discharge e- (ef- \ ex- \exo- ）= out evade流逸\ export出口\ exclude排除 \ ex-soldier退伍军人\ ex-husband前夫\ exobiology外太空生物学 extra- = outside extracurricular课外的 \ extraordinary格外的 fore- = before forehead前额\ foreground前景




counter- counterrevolution反革命 \ counterattack反击
de- demobilize复员 \ deforest砍伐森林\ derail火车出轨 \ devalue 贬值 dif- diffuse散布 dis- dislike厌恶 \ dishonest不诚实的 \ disability无能\ disorganize解散\ discolor使褪色 \ distract 分散（注意力等）



hyper- hypersensitive过度敏感的 \ hypersonic特超音速的
il- (im- \ in- \ ir- ) illegal非法的\ immoral不道德的 \ irregular非经常的 mal- maltreat虐待\ malnutrition营养不良 \ malfunction功能失调 mis- mistake错误\ mistrust不信任 non- nonsmoker不抽烟的人 \ nonproductive非生产性的 \ nonmetal非金 属 out- outnumber在数量上超过 \ outflow流出\ outlaw夺去法律上的权利 over- overuse使用过度 \ overlook俯视；忽视 \ overthrow推翻