问题
单项选择题
The main purpose of the talk is to ______.
A．illustrate how wheels, cameras and computers were invented
B．discuss how great inventions influence our way of living
C．compare people’s attitudes towards new inventions
D．compare inventions of the 19th century with that of the 20th century
答案
参考答案：B
解析：本题测试对全文的综合理解和推测能力，要求判断讲话的目的。可根据文中的重要信息，如“things that changed the way we live”，“They began to work instead to make life better”，“By this time most people had a very good life”，“New inventions will someday allow us to do things we have never yet dreamed of”等判断出，不同时代的发明创造很大地改变了人们的生活方式，因此正确答案为B。