U4 Numbers 课文 Review Everyone’s language How many languages do you know? Everyone knows at least ( 至少) two---his or her own language and the international language of numbers. (国际化的数学语言) Ancient numbers In ancient times, people wrote numbers in many different ways, as these pictures of the number 6 show. However, they nearly all counted in the s___1___ way – in tens. Zero Most of us use the system of numbers with numbers from 1 to 9 and 0 (zero). With these ten numbers, we can write any number from the biggest to the s___2___. The Indians first invented and developed the 1 to 9 system of numbers. They then invented the zero. This was a very important invention because it made it e___3___ to write big numbers and to calculate. Calculating machines One of the first calculating machines was an abacus ( 算盘). Abacuses are so f___4___ and accurate that people still use them today. A modern electronic calculator can add, subtract, multiply and divide. It can also calculate percentages and square roots. Computers are very powerful calculating machines. In a flash, a computer can do a calculation that you could n___5___ do in your whole lifetime. Brain against computer Some people call the brain a living computer. Is a human brain a more powerful calculator than a computer? The following story may give an answer. Shakuntala Devi is a lady from India with an a___6___ brain. Shakuntala and a very powerful computer were given this problem to solve. Shakuntala’s brain took fifty seconds to find the answer, like lightning. The computer took a minute. However, someone had to first program the computer with i___7___, and that took many hours. No one had to program Shakuntala! Use your own living computer to solve the problem above. If it is not powerful enough, you will find the answer on page 67. 【答案】1. same 2. smallest 3. easier 4. fast 5. not 6. amazing 7. instructions 根据音标写单词 8A U4 Vocabulary（牛津） 单词 音标 词性 中文 [dɪ'vaɪd] v. 除以 [dɪ'griː] n. 度数 [ɪ'speʃ(ə)lɪ] adv. 非常 ['kælkjʊleɪt] v. 计算 [breɪn] n. 脑 [pɑːt] n. 部分 ['læŋgwɪdʒ] n. 预言 ['nɪəlɪ] adv. 几乎 ['sɪstəm] n. 系统 [ɪn'vent] v. 发明 [dɪ'veləp] v. 发展 [ɪn'venʃ(ə)n] n. 发明 ['æbəkəs] n. 算盘 ['ækjʊrət] a. 正确的 [ɪˌlekˈtrɒnɪk] a. 电子的 ['kælkjʊleɪtə] n. 计算器 [səb'trækt] v. 减去 ['mʌltɪplaɪ] v. 乘以 [pə'sentɪdʒ] n. 百分率 ['paʊəfʊl] a. 强有力的 [kælkjʊ'leɪʃ(ə)n] n. 计算 [həʊl] a. 整体的 ['laɪftaɪm] n. 一生 [ə'genst] a. 与…相比 ['lɪvɪŋ] a. 活着的 ['hjuːmən] a. 人的 ['fɒləʊɪŋ] a. 下列的 [ə'meɪzɪŋ] a. 令人惊奇的 [sɒlv] v. 解决 ['laɪtnɪŋ] n. 闪电 ['prəʊgræm] n. 编写程序 ['paʊə] n. 能量 [kəm'pliːt] v. 使完整 [tʃek] v. 检查 【答案】divide degree especially calculate brain part language nearly system invent develop invention abacus accurate electronic calculator subtract multiply percentage powerful calculation whole lifetime against living human following amazing solve lightning program power complete check 词汇语法复习 （1）8A U4 词性转换整理 1 v. 计算 n. 计算机 n. 计算 adj. 计算的 n. 部分 adv. 部分地 v. 发明 n. 发明家 n. 发明物 v. 发展，壮大 adj. 发达的 adj. 发展中 n. 发展 n. 能量 adj. 有能量的 adj. 活着的 adj. 活的 2 3 4 6 7 v. 住 n. 生活 v. 跟着的 adj. 下列的 v./adj. 完成，完整的 adv. 完整地 8 10 【答案】1.calculate calculator calculation calculating2.part partly3.invent inventor invention 4.develop developed developing development 5.power powerful6.power powerful7.living alive live life 8.follow following9.complete completely （2）8A U4 课内知识点 根据中文翻译英文。 1. divide E.g. 1) 2) v. 除以 15 ___________ by 5 is 3. 15 除以 5 等于 3. If you ____________ 15 by 3, you get 5.如果你把 15 除以 3 就得到 5. 【答案】1) divided 2) divide 2. degree E.g. 1) n. 度数 Water freezes at _________ _________ Celsius.水在零摄氏度结冰。 2) A right angle is 90 ___________. 直角为 90 度角。 3) My brother has got a doctor’s ___________.我哥哥拥有博士学位。 【答案】1) zero degrees 2) degrees 3) degree 3. especially adv. 十分，非常 E.g. 1) He has been __________ busy this week. 他这星期特别忙。 2) I like the country, __________ in spring. 我喜欢乡村，尤其在春天。 【答案】1) especially 2) especially 4. nearly E.g. 1) adv. 几乎，差不多 I’m __________ 16, it’s my birthday next Friday. 我快 16 岁了，下周五就是我的生日。 2) It’s _________ lunchtime.= It’s __________ lunchtime.快到吃午饭的时间了。 3) There is __________ __________ water left in the bottle. 瓶子里快没水了。 4) It is __________ _________ so pretty as it was before. 它远不及以前漂亮了。 【答案】1) nearly 2) nearly, almost 3) almost no 4) not nearly 5. system E.g. 1) n. 系统 I prefer this __________ of teaching English. 我更喜欢这一套英语教学体系。 2) They ar