问题 问答题 简答题

杂多糖和均一糖有什么功能性差别?

答案

参考答案:

由一种单糖分子缩合而成的多糖,叫做均一性多糖。自然界中最丰富的均一性多糖是淀粉和糖原、纤维素。它们都是由葡萄糖组成。淀粉和糖原分别是植物和动物中葡萄糖的贮存形式,纤维素是植物细胞主要的结构组分。

阅读理解

A woman was collecting money for a church charity. The money she collected was going to be given to poor children who had no parents to take care of them. She went from apartment to apartment and from house to house. She knocked on doors and asked for money. She always said the same thing. “Good morning, I’m collecting for a church charity. Please give generously. We need $5,000.” Then she held out a collecting box. Most people put a few coins in the box. An artist lived in one of the apartments. He opened the door. “Good morning.” she said. “I’m collecting for a church charity. Please give generously. We need $5,000.” The artist thought for a moment, then he said, “I’m sorry, but I don’t have any money. However, I’ll give you a painting. It’s worth $ 400.” The woman thanked the artist and took the painting away. A week later she called on him again. “I’m sorry to trouble you again,” she said, “but we still need more money. I need another $ 100. Can you help?” “Of course,” the artist said. “I’ll increase the value of my painting to $ 500.”

小题1:Who was the woman collecting money for?

A.Poor children.

B.Herself.

C.Her friends.

D.A church.小题2:What did most people give her?

A.A lot of money.

B.A few dollars.

C.Paintings.

D.Very little money.小题3:Why didn’t the artist give money to her?

A.He was not a generous man.

B.He did not have any money.

C.He had too many paintings.

D.His paintings were worth a lot of money.小题4:Did the woman collect enough money at last?

A.No, she didn’t.

B.Yes, she did.

C.We don’t know.

D.Yes, she does.小题5:How much money does she need?

A.$5,000

B.$5,00

C.$4,00

D.We don’t know.

判断题