问题 问答题 简答题

革兰染色的主要步骤、结果及实际意义是什么?

答案

参考答案:

(1)革兰染色基本步骤:涂片、干燥、固定,初染:结晶紫lmin;媒染:卢戈氏碘液lmin;脱色:95%乙醇0.5min;复染:稀释复红lmin。

(2)结果革兰阳性菌呈紫色,革兰阴性菌呈红色。

(3)意义:经革兰染色可将细菌分为G+菌和G-菌,有助于鉴定细菌,用来指导临床选择药物,有助于研究和了解细菌的致病性等

阅读理解

阅读理解。

     Do you want to do something for wildlife but don't quite know what? Or how? Would you like to

make new friends who share your interest in environmental protection? Just go to www. China. org/kids, 

a website run by World Wildlife Fund (WWF) China.

     The first section to look at is "Help Make a Difference",  which offers information and interesting

cartoon  pictures on how to make the world a better place. There is everything from tips on how to  

help  keep  endangered  species (濒危物种) alive  to advice about recycling and saving natural resources.

In "Chit-Chat", you can communicate with people from all over the world who care about the

environment  through the message board.If you want to take part in some interactive (互动的) activities,

you can enter the art competition in "Through Your Hands" section. All you need to do is to think of an

activity that can  help the environment and paint a picture on how people should do about it.

Discuss and say true or false.

( )1. This passage introduces five websites to us.

( )2. "Help Make a Difference" offers information and pictures on how to make the world a 

        bettr place.                    

( )3.  In "Chit-Chat", you can only talk with people from all over China who care about 

        the environment.                  

(     )4. In "Through Your Hands", you need to think of an activity that can help the environment and 

        paint a picture on how people should do about it.                  

单项选择题