StringBuffer (字符串缓冲类) String类的对象创建后其包含的字符序列不可变， 对多个String类直接量进行连接操作会创建多个临 时的String类对象

1.1名词的分类 名词可以分为专有名词（Proper Nouns）和普通名词 (Common Nouns），专有名词是某个（些）人，地方，机构 等专有的名称，如Beijing，China等。普通名词是一类人或东 西或是一个抽象概念的名词，如：book，sadness等。普通名 词又可分为下面四类：

Unit 1 1. The delegation has already arrived, but I didnt know it until this morning A.willcomeB.hadbeencomingC.wascomingD.comes

第一节 语法的性质和语法单位 第二节 语法单位的组合规则 第三节 语法单位的聚合规则 第四节 同义结构与歧义结构 第五节 语言的语法类型 第六节 语法的发展

When we talk, we don't talk in single words but in groups of words spoken continuously. These groups of words which are closely connected in meaning and in grammar are called sense groups. sense group is tone-group-(语调群) in intonation. long sentence can be cut up into two or more tone-groups We may make a short pause after each group, but not during the group

16.1 Saying what you've done (1)Grammar Complete this table of irregular verbs. Infinitive Past tense Past participle

11.1 Finding someone a job (1)Grammar Complete this list of irregular verbs. Present Past simple Present Past simple

Progress test 1 5.1 Grammar Complete these sentences with the correct form of the verb in(brackets). Use short forms if Gina and I()work(work) for Eurobags. Gina(2)

Unit Four Five symbols of america Five symbols of america Learn some important new words and phrases Appreciate the passage in section A Comprehension of the material in section A 1. Communicative method 2. Audio-lingual method 3. Grammar-translation method

KEY: GRAMMAR 1-5 CABAC 6-10 ADBAC 11-15 ACBAB 16-20 CACCD 21-25 BDABC 26-30 DCBCA 31-35 CCDAB 36-40 DABAC