11) The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire,although nobody knows exactly when he acquired the use of the latter.
12) Animal have a few cries that serve as signals,but even the highest apes haven’t been found able to pronounce words,even with the most intensive professional instructions.
动物会发出几种叫声作为信号，然而人们发现，即使是最高级的猿经过强化的专业训练也不能说出话来。
13) Agriculture made possible an immense increase in the number of the human species in the regions where it could be successfully practised.
在农业繁荣的地区，农业的发展使当地人口的数量大幅度增长。
14) These inventions and discoveries---fire,speech,weapons,domestic animals,agriculture and writing---made the existence of civilized communities possible.
火,语言,武器,家禽,农业和文字的发明,使得文明社会有了存在的可能.
15) There was progress---there were even two inventions of great importance,namely gunpowder and the mariner’s compass---but neither of these can be compared in their revolutionary power to such things as speech and writing and agriculture.
16) Growth in electronic commerce is not a straight line trend---it come slowly at first,then accelerates rapidly.
电子商务的发展并非一帆风顺，而是经历了缓慢起步才加速前进的。
17) Nonetheless,although it may take six years to reach sales of 1 trillion dollars,it won’t take six more to reach 2 trillion,nor perhaps even two to expaned from 2 to 4 trillion dollars.
尽管可能需要六年时间才能使销售收入达到1万亿美元,但是从1万亿到2万亿美元则不会再用六年时间,而从2万亿到4万亿美元甚至用c commence will turn the world into one giant shopping mall for products,services,and investments.
电子商务将会把世界变成一个集提供产品，服务与投资与一体的大型购物中心。
19) By 2005,more than half of the average employees’ working hours in advanced countries(like the United States and the United Kingdom)will be spent at home.
到2005年，发达国家雇员的平均工作时间将有一半以上在家中度过。
20) Employees will be,figuratively speaking,in the driver’s seat.