问题 问答题 简答题

由巴斯德设计的著名曲颈瓶试验,有何重大的理论与实际意义?

答案

参考答案:理论意义:彻底推翻了长期以来占统治地位的生命的自然发生说;为微生物学的建立奠定了坚实的理论基础;为创立消毒、灭菌技术提供了重要的科学依据。

实际意义:推动了寻找各种传染病病原菌的研究;对防治人类和动、植物病害作出了巨大的贡献;促进了外科消毒术的建立;使发酵工业从自然接种发展到人工纯种发酵的新阶段;推动了消毒灭菌技术的发展。

单项选择题 A1型题
阅读理解

In almost every big university in the United States, football is a favorite sport. American football is not like soccer.

Players sometimes kick the ball, but they also throw (扔) the ball and run with it. They try to take it to the other end of the field; they have four chances to move the ball ten yards (码). They can carry it or throw it. If they move it to the end of the field, they can receive six points. This is called a touch-down (持球触地).

It’s difficult to move the ball. Eleven men on the other team try to stop the man who has the ball. If the man does not move the ball ten yards, his team kicks the ball to the other team.

Thousands of people come to watch it when there is a football game. They all yell for their favorite team. They dance and jump while they are yelling. Each team plays ten or eleven games each season. The football season usually begins in September and ends in November. If a team is very good, it may play another game after the season ends. The best teams play again on January lst. Many people go to see these games and many others watch them on TV.

小题1:In America, football players can _______.

A.only kick the ball

B.only throw the ball

C.only carry the ball

D.kick, throw and carry the ball小题2:There are _______ on each team.

A.ten players

B.eleven players

C.twelve players

D.thirteen players小题3:If the man does not move the ball ten yards, his team has to _______.

A.go home

B.carry the ball ten yards

C.run with it

D.kick the ball to the other team小题4:The best teams play again _______.

A.on Christmas

B.after the season ends

C.on New Year’s Day

D.on Sunday小题5:The underlined word “yell” in the passage means “_______”.

A.shout (喊) loudly

B.jump

C.talk loudly

D.sing