问题 选择题

2008年诺贝尔化学奖表彰了发现和研究绿色荧光蛋白质(GFP)的科学家。据 研究报道:GFP在厌氧条件下不能发射荧光,而增加氧分子会渐渐开始发光。 生色团是GFP发出荧光的物质基础,如下图所示的结构形成了GFP生色团的 核心。下列有关GFP的说法不正确的是

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A.遇强还原剂Na2SO3或FeSO4时,GFP发射荧光能力减弱

B.该生色团的肽链结构中含有甘氨酸单元

C.该生色团结构中没有手性碳原子

D.温度超过70℃时,GFP因变性其荧光会消失

答案

答案:C

选择题
阅读理解

People who like travelling have their reasons. They believe that travelling can help them expand their field of view,especially in the geographical and historical sense. They also think that touring will give them more chances to enjoy different kinds of food and experience new things that would never be brought by other activities. But those who dislike travelling also have some reasons.

Travelling,in my opinion,does more good than harm. Most importantly,it broadens(使扩大)our mind. We can get in touch with other civilizations(文明),cultures,customs and ideas.

Through history,most people travelled because of necessity(必要性)-not for pleasure. People travelled just in order to remain alive. They searched for food to eat or places to live in. They sometimes ran away from enemies. This is not to say that no one ever travelled just for fun of it. In ancient times,for example,rich Romans travelled all the ways to Greece to take part in the Olympic Games,and festivals. Of course,some people decided to travel just out of curiosity(好奇心).They wanted to find out what it looked like beyond the horizon(地平线).Also business travel has been going on for centuries. Traders could not only make money but also learn to speak several languages and be introduced to different cultures.

So,travelling does enrich our mind and draw new ideas to us. There is no doubt that we can get much from it.

小题1:The underlined word “expand” in Paragraph 1 can be replaced by“___________ ”.

A.widen

B.protect

C.lose

D.decide小题2:According to the passage,in the past most people traveled____________.

A.for fun

B.for knowledge

C.to get experiences

D.to make a living小题3:How many reasons for travelling are mentioned in Paragraph 3 ?

A.Three.

B.Four.

C.Five.

D.Six.小题4:What’s the main idea of this passage?

A.Different kinds of travelling.

B.Travelling enriches our mind.

C.Ways to enjoy yourself while travelling.

D.The advantages and disadvantages of travelling.