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[单选题]

蛋白质变性是由于( )

A.氢键被破坏

B.肽键断裂

C.蛋白质降解

D.水化层被破坏及电荷被中和

E.亚基的解聚

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更多“蛋白质变性是由于（) A．氢键被破坏 B．肽键断裂 C．蛋白…”相关的问题

第1题

In many English homes, people eat four meals a day: breakfast, lunch, tea and dinner.Peopl

In many English homes, people eat four meals a day: breakfast, lunch, tea and dinner.

People have breakfast at anytime from seven to nine in the morning. They eat porridge, eggs or bread. English people drink tea or coffee at breakfast.

Lunch comes at one o'clock. Tea time is from four to five in the afternoon, and dinner is about half past seven. First, they have soup, and then they have meat or fish or vegetables. After that, they eat some other things, like bananas, apples or oranges. But not all English people eat like this. Some of them have their dinner in the middle of the day. Their meals are breakfast, tea, and dinner and all these meals are very simple.

Most English people eat ______ meals a day.

A．two

B．three

C．four

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第2题

A．British spend more time preparing meals.B．British just prepare for breakfast and lun

A．British spend more time preparing meals.

B．British just prepare for breakfast and lunch snack.

C．British people have three meals a day.

D．British people have two big meals a day.

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第3题

听力原文：In different parts of Britain, people call their meals by different names. It's v

听力原文： In different parts of Britain, people call their meals by different names. It's very complicated. For most people the main meal of the day is called dinner. But some families eat this at mid-day, others eat it in the evening. People who have dinner in the evening have a smaller meal called lunch at mid-day, and people who have dinner at mid-day usually have another meal which they call tea between five and six, or they have supper a little later.

For most people, breakfast is a bowl of cereal followed by toast and jam with a cup of coffee or tea. Lunch is usually a very quick meal; most people have a sandwich or a light snack. Dinner may have two or three courses. First a starter, for example soup, then a main course with meat or fish and finally a dessert.

It is probably tree that British food does not have a very good reputation among people from overseas. In general, though, it has improved considerably in recent years.

(26)

A．Supper.

B．Lunch.

C．Breakfast.

D．Dinner.

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第4题

What does the man mean？A．He wants to have lunch with the woman.B．He can't have lunch with

What does the man mean？

A．He wants to have lunch with the woman.

B．He can't have lunch with the woman.

C．He doesn't like to have lunch with the woman.

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第5题

____________time do you have lunch？一I usually have lunch at 12. A. What B. Which

____________time do you have lunch？

一I usually have lunch at 12.

A. What

B. Which

C. When

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第6题

I have lunch at home.A．TrueB．False

I have lunch at home.

A．True

B．False

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第7题

We usually have lunch at school.We ______ have lunch at school.

We usually have lunch at school.

We ______ have lunch at school.

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第8题

Millions of hamburgers are eaten by pepole in every comer of the world every, day. Togethe

r with hot dogs and Coca-Cola, hamburgers have been the most important American contribution(贡献) to international eating habits.

The name "hamburger" has nothing to do with ham(火腿). It is believed that the hamburger was first brought to the United States by Germans from the city of Hamburg some time in the 1850s. From then on the hamburger became a kind of popular American fast food.

Now young people in Asia, Europe and South America have learned to eat while on the move; a hamburger in one hand and a soft drink in the other. There have been cries to anger from Italy and Spain about the shortening of the usual lunch break. Instead, young people have discovered a lunch for which they don't have to stop at all.

However, there are clouds over the hamburger's world. People who concern about health dislike the high animal fat in the hamburger. They think the time saved seems a high price to pay for poor health. The packages in which hamburgers are usually served are causing serious pollution problems in many large cities. Big hamburger companies are destroying large areas of South American rainforest to produce the cheap meat they need. So, will the hamburger celebrate its next century？

In which way do hamburgers change people's eating habits？

A．People can have their meals at any time of the day.

B．They can be served in any restaurant.

C．People can have them with soft drinks.

D．Meal time can be greatly reduced.

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第9题

Millions of hamburgers are eaten by people in every corner of the world every day. Togethe

r with hot dogs and Coca-Cola, hamburgers have been the most important American contribution(献) to international eating habits.

However, there are clouds over the hamburger' s world. People who concern about health dislike the high animal fat in the hamburger. They think the time saved seems a high price to pay for poor health. The packages in which hamburgers are usually served are causing serious pollution problems in many large cities. Big hamburger companies are destroying large areas of South American rainforest to produce the cheap meat they need. So, will the hamburger celebrate its next century？

In which way do hamburgers change people's eating habits？

A．People can have their meals at any time of the day.

B．They can be served in any restaurant.

C．People can have them with soft drinks.

D．Meal time can be greatly reduced.

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