去度假之前，生物学家亚历山大·弗莱明把一个带有细菌的盘子留在了实验室里。

　　4．In the summer of 1905，this outspoken young man ________ his one­year­old baby ________ he was suddenly inspired.

　　1905年的夏天，这个直率的年轻人正在摇着他一岁大的孩子时，突然灵感就来了。

　　【答案】　1.There is no doubt　2.leaving him sitting

　　3．with bacteria in it　4.was rocking；when

　　　阅读P24－P25课文，并从四个选项中选择最佳答案

　　1．Why would people have a real dilemma，if they had to choose the 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，communication，transport and many other fields，and they all had a great influence on the world.

　　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 one­year­old baby，he was inspired.

　　D．His dream inspired him.

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

　　A．Alex Fleming's.　　 B．Edwin Hubble's.

　　C．Albert Einstein's. D．Eckert and Mauchly's.

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

　　A．To do some difficult experiment.

B．To improve the accuracy of the missiles.