问题 问答题 简答题

论述肌肉中的糖与乳酸在屠宰前后一段时间的变化及其与肉品质的关系?

答案

参考答案:

肉中的糖以游离的或结合的形式广泛存在于动物的组织和组织液中,例如葡萄糖是动物组织中提供肌肉收缩的能力来源,核糖是细胞核酸的组成成分,葡萄糖的聚合糖——糖原是动物体内糖的主要存在形式,在动物的肝脏中储量可高达2%-8%。肉中糖的含量因屠宰前及屠宰后的条件不同而有所不同,糖原在动物宰杀后的肌肉中进行无氧酵解,生成乳酸,对肉类的性质、加工与储藏具有重要意义。刚屠宰的动物乳酸含量不过0.05%,但经24h后增至1.00%-1.05%。

阅读理解

阅读理解。

     Dr. Albert Schweitzer was a jungle doctor in Africa. He was born in France. He had learned to play

the piano since he was five and he was a very good musician. He decided to be a doctor when he was 30

years old. Then he studied medicine for eight years. After that, he asked to be sent to Africa in 1913.

     Dr. Schweitzer took big boxes of medicine with him to Africa. He had to go through a lot of dangerous

places. At first the new white doctor was not welcome, but soon the people of Africa understood that he

was their friend and they helped him build his first small hospital near a river. Many people came to the

hospital. Dr. Schweitzer worked day and night.

     When he ran out of money and needed more medicine t he would go back to Europe to make money

by playing music. Then he would return to Africa. Later he built a bigger hospital. He spent most of his life

in Africa, not only helping sick people but also teaching the people how to help each other.

     During World War I, he was sent to prison. He found that war was more terrible than disease (疾病).

When the war was over, he made a speech everywhere to propose (提倡) peace and respect (尊敬) for

lives. In 1952, he was named winner of the Nobel Peace Prize.

1. Albert Schweitzer was about ________ years old when he went to Africa.

A. 30

B. 36

C. 38

2. People in Africa were ________ to him when Schweitzer got there at first.

A. kind

B. unfriendly

C. polite

3. Schweitzer's first hospital in Africa was ________.

A. far from rivers

B. built by his friends who came with him

C. built with the help of people in Africa

4. When Schweitzer ran out of money in Africa, ________.

A. he worked for longer hours

B. he went back to Europe and made money by playing music

C. people in Africa helped him

5. Which is TRUE according to the passage?

A. Schweitzer studied medicine for seven years.

B. Schweitzer was born in Africa.

C. Schweitzer was named winner of the Nobel Peace Prize in 1952.

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