it_is_possible_to_ single_out_a_few_pioneers_of_the_20th_century.

　　4．Translate the following sentence in the last paragraph into Chinese.

　　Without the breakthroughs of these pioneers in science and technology，whether lucky or planned，the world as we know it today would have been a completely different place.

　　没有这些先驱者们在科技方面的重大突破，不管是靠运气还是有计划地进展，我们今天所了解的这个世界将会是完全不同的样子。

　　Ⅱ.Careful－reading

　　1．Why would people have a real dilemma，if they had to choose the single most important discovery of the 20th century?

　　A．Because different people have different ideas and it's difficult to choose.

　　B．Because there were no great discoveries in the 20th century.

　　C．Because there was no common standard to judge.

　　D．Because so many amazing discoveries were made in medicine，communications，transport and many other fields，and they all had a great influence on the world.

　　答案　D

　　2．How did Einstein think of the equation "E＝mc2"？

　　A．When he was at work.

　　B．His assistant helped him.

　　C．When he was rocking his one－year－old baby，he was inspired.

　　D．His dream inspired him.

　　答案　C

　　3．Whose discovery can be used to save people's lives according to the text?

　　A．Alexander Fleming's.

　　B．Edwin Hubble's.

　　C．Albert Einstein's.

　　D．Eckert and Mauchly's

　　答案　A

4．What's the original purpose of designing the first computer?