The world of numbers 课堂练习

Chapter 4 The world of numbers 一．翻译下列短语  1．古代 ____________________              2. 许多不同的方法 _______________  3．数字体系 ________________              4. 由……组成 ___________________  5．计算器___________________              6. 计算 _________________________  7．一瞬间___________________              8. 能够 _________________________  9．一生_____________________              10. 人脑 ________________________  二．完成下列句子  1．印度人首先发明并发展了1-9数字体系。后来他们又发明了零这个数字。  The Indians first ___________ and developed the 1 ___________ 9 system of numbers.  Then they invented the z____________.  2．（零的发现）使得写大的数字和计算变得更容易。  It made _____________ easier ____________ big numbers and to _____________.  3．现代的计算器可以计算加、减、乘、除，还可以算百分比和平方根。  The modern ___________ can add, ____________ , ____________and __________.  It can also ___________ percentages and _______________.  4. 电脑可以在一瞬间进行计算，而你有可能一辈子都算不出来。  A computer can do a _____________ in a ___________ , but you might not be ___________ to do in your ___________ lifetime.  5．一些人把人脑叫做活电脑。人脑比电脑更强大吗？  Some people ____________ the brain a ________________ computer.  Is a human brain more   _____________ _______________ a computer？  三．短文填词  Shakuntala Devi is from India. She has an a___________ (1) brain and can calculate like  l__________ (2). In America, Shakuntala and a very powerful computer were given a problem to s__________ (3). Shakuntala’s brain t_________ (4) 50 seconds to find the answer. The computer took a m__________(5).  However, before the computer could begin c_________ (6), someone had to s________(7) many hours programming it with i________________(8) . No one had to p___________ (9) Shakuntala. Is your brain powerful e__________(10) to be against the computer?