been destroyed.

他仔细检查了一下，看到碟子里有一种蓝色的霉斑，其周围的细菌都被消灭了。

3.There is no doubt.........是毫无疑问的。

There is no doubt about it.

关于这一点是毫无疑问的。

Ⅰ.课文判断正(T)误(F)

1.The person who discovered penicillin was Alexander Fleming.(T)

2.Fleming had been studying bacteria in his laboratory when the discovery happened.(F)

3.During the Second World War，Fleming's discovery helped to cure plenty of people.(T)

4.Percy Spencer discovered microwaves by mistake.(T)

Ⅱ.课文阅读理解

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.