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 [d?'va?d] v. 除以 [d?'gri?] n. 度数 [?'spe?(?)l?] adv. 非常 ['k?lkj?le?t] v. 计算 [bre?n] n. 脑 [pɑ?t] n. 部分 ['l??gw?d?] n. 预言 ['n??l?] adv. 几乎 ['s?st?m] n. 系统 [?n'vent] v. 发明 [d?'vel?p] v. 发展 [?n'ven?(?)n] n. 发明 ['?b?k?s] n. 算盘 ['?kj?r?t] a. 正确的 [??lek?tr?n?k] a. 电子的 ['k?lkj?le?t?] n. 计算器 [s?b'tr?kt] v. 减去 ['m?lt?pla?] v. 乘以 [p?'sent?d?] n. 百分率 ['pa??f?l] a. 强有力的 [k?lkj?'le??(?)n] n. 计算 [h??l] a. 整体的 ['la?fta?m] n. 一生 [?'genst] a. 与…相比 ['l?v??] a. 活着的 ['hju?m?n] a. 人的 ['f?l????] a. 下列的 [?'me?z??] a. 令人惊奇的 [s?lv] v. 解决 ['la?tn??] n. 闪电 ['pr??gr?m] n. 编写程序 ['pa??] n. 能量 [k?m'pli?t] v. 使完整 [t?ek] 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. ... ...
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