Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need．It has been demonstratedthat rats will, when given a choice over a period of time, prefer wa 题目和参考答案——青夏教育精英家教网—

题目内容

Animals seem to have the sense to eat when they are hungry and they do not eat more than their bodies need．It has been demonstrated（证明）that rats will, when given a choice over a period of time, prefer water with vitamins(维生素) to water without vitamins even though there is no difference in taste or smell between the two water bottles．When a fragrant（香的）flavor（作料）was added to the vitamin-enriched water, the rats did seem to prefer it and kept drinking it ,even after the vitamins were switched to the clear water．In time, however, they broke the habit and went back to where the necessary vitamins were．

In a classic experiment, babies of 6 to 12 months old were placed in a cafeteria（自助） feeding arrangement, with a wide selection of baby food before them．They were given whatever food they pointed to or appeared interested in．We are told that at first they showed some unusual eating patterns, but that over a period of time they managed to select well-balanced diet．

So, in choosing food, rats and babies do seem to know and act on what's best for them．Apparently, there is a kind of “body wisdom”, which humans soon lose．Most of us do not eat as wisely as we could．Many of our food preferences are culturally determined and influenced by long-formed habits．Some people eat fox, dog and blackbirds, while we eat cows and pigs．So what people eat and how much they eat seems to be greatly influenced by what is going on around them．

In the experiment on rats, a fragrant flavor was added to the rats’ drinking water to _____________ .

A．encourage rats to drink vitamins-enriched water

B．test whether rats know which drink is good for them

C．find out rats’ preference in flavor

D．demonstrate the vitamins are tasteless

According to the passage ,adults eating habits differ from those of babies because_________．

A．adults know better than babies what kind of food are good for their health

B．adults usually cannot resist the temptation of various delicious foods

C．adults have more choices of food than babies in eating patterns

D．adults' eating habits are closely related to the social and cultural customs

The author implied in the passage that most of us_________．

A．eat a balanced diet

B．choose the food that is of nutrition

C．have the habits influenced by the surroundings

D．like to eat the food with a fragrant flavor．

As far as their eating habits are concerned, babies and rats are similar in that_________．

A．both prefer flavored food and drink

B．both have the wisdom to choose a balanced diet

C．both have the same eating patterns

D．both develop a taste for the same kinds of flavors

【小题1】B

【小题2】D

【小题3】C

【小题4】B

解析:

略

练习册系列答案

相关题目

　　In 1931, it was discovered that some unknown substance present only in certain foods was necessary for good health. This substance was what is now called “Vitamin A”.

　　Vitamin A's biggest job is to keep the eyes going. Without it, people and animals get “night blindness” and eye problems. Lack of Vitamin A for a long time can even cause total blindness, particularly among children. This had a chance to be tested in Denmark during World Was I. Because of food shortage, many children had to eat man-made butter and skim milk（脱脂奶）, which contains no Vitamin A. Soon, they developed eye diseases. It was after they were given real butter and whole milk that they had no eye problems.

　　After Vitamin A was discovered, it took more than thirty years of experiments for scientists to be able to get a small amount of pure Vitamin A. Vitamin A is manufactured and is used successfully to treat a number of diseases. You can easily get enough Vitamin A by eating a variety of food. Good sources of Vitamin A are liver（肝脏） from some animals and dairy products such as milk and cream. Not only many vegetables contain carotene（胡萝卜素）, from which your liver can make its own Vitamin A, some fruits also provide carotene which helps your liver to supply Vitamin A. As long as you are getting Vitamin A from food you won't need to take any extra in the form of liquid or pills.

(1)According to the passage, if Vitamin A is not provided enough, which of the following are likely to be affected most se riously?

[　　]

(2) Vitamin A is a very. important substance mainly because it _______.

[　　]

A．is hard to made

B．helps to keep one's eyes healthy

C．can make butter more delicious

D．can not be produced in large quantity

(3) What made the children in Denmark get eye diseases during World War I?

[　　]

A．The war they experienced.

B．Their poor housing conditions.

C．The experiments on food.

D．The lack of Vitamin A in their food.

(4) According to the text, the following are all good sources of Vitamin A except _______.

[　　]

(5) Which of the following could be the best title of the passage?

[　　]

A．The Discovery of Vitamin A.

B．Some Unknown Substance.

C．Sources for Vitamin A.

D．Vitamin A.

[1] While the Amazon may seem far away, we are all closely connected to it through our actions. Now there are largely the results of great demand for forest products and agriculture land, which makes its plant and animal species in danger. Fortunately, we can help save the Amazon rainforest by making the right choices in our daily lives. By being smart consumers, we can make a difference and help reduce human pressures on the forests and rivers.

[2] Look for forestt products that you don ’ t need to destroy forests to get. We can choose many rainforest products like Brazil nuts and coffee, which can be got without destroying forests. And at the same time the money you provide can help local people to _______________.

[3] Recycle everything possible. Such items as batteries, cloth, glass, paper in our daily life can be recycled with different techniques. For example, the collected glass pieces are taken to a glass recycling factory where they are madeinto new glass bottles through a series of processing.

[4] Buy the rightpets. Many wild animals are illegally caught in the Amazon and sold as pets and large numbers of these animals die in the process. It ’ s important to ask where the animal comes from and to require a store to give you proof when you decide to buy a pet.

[5] Carefully select the appliances( 家用电器 ) in your home . For example, order low-flow shower heads ( 喷头 ),which can reduce your use of hot water and use of energy to heat the water. So it ’ s wise to select the appliances which can save energy.

[6] Turn off appliances that you are not using and take the plug off them..Switch off TVs, computers, lights, etc. even when they are not being used and make sure the plug off the switch of some appliances that se electricity including TVs, video and audio systems, computers.

76. What is the main idea of the text ? (no more than 8 words)

________________________________________________________________________________

77. Fill in the blank in Paragraph 2 with proper words. (no more than 4 words)

And at the same time the money you provide can help local people to ________________________

78. L i st two threats to the wildlife in Amazon.(no more than 5 words)

________________________________________________________________________________

79. What ’ s the purpose of choosing the appliances carefully ?(no more than 4 words)

________________________________________________________________________________

80. What does the word “ they ” (L i ne 2, Paragraph 6) probably refer to?(no more than 1 word)

30^th June

Dear Aihua,

How are you? Sorry I haven’t written for so long. I’ve been quite busy planning my holiday with may older brother, Coin. Do you still remember the trip I told you about? I told you Colin and I would spend a few weeks traveling before he goes to university. Well, now we’re ready to go! We’re going to visit so many exciting places and do lots of astonishing things. We will go to Africa first. I can’t wait! Have you been there?

We leave London on 15^th July, and we’ll be flying to Morocco, in Northern Africa. We’re going to travel on camels through the Sahara Desert. It’s the biggest desert in the world-about the size of The US! I expect it will be very hot, dry and dusty there. We’ll be traveling by camel, with local guides, camping in tents and sleeping on the ground in our big, thick sleeping bags. I’ve heard that we can se beautiful stars on clear nights. I’ll bring a torch with me so that I’ll be able to see in the dark. The whole trip will take six days. That means I’ll have to sit on a came for almost a week-how uncomfortable! I hope my camel likes me!

After the trip by camel, we’ve going to travel down the River Nile. We’ll start at Lake Victoria. A little way down the river from Victoria, the water actually gets quite rough. So, we’ll go white-water rafting. It’s quite dangerous, but very exciting! We have to wear special clothing, a helmet and a life jacket, just in case the raft gets turned upside down or sinks after white-water rafting, we’re going on a trip to see wild animals in Kenya. We’ll live with the local people in their villages, and eat and drink like they do, including cow’s blood! Do you think I should drink it?

Since we’ll be walking every day for almost two weeks, I’ll need to buy a large, strong, light backpack to carry my supplies of food and water. During the day, we’ll walk across the land, following the footprints of big animals such as elephants, lions and giraffes. We’ll try to get as close as possible to the animals, even though they’re dangerous, so that I can take some really good photos. But don’t worry about me―our Guides will have guns with them to scare the animals away if they come too close. I really want to see an elephant up close. Colin wants to see a giraffe.

After that, we’ll be moving on to Tanzania, where we’re going to climb Mount Kilimanjaro. Mountain climbing can be very tiring, and many people feel sick as the air gets thinner, so Colin and I will make sure that we will get enough rest after sunset. The African part of our trip will take about four weeks. Then we’re going to the Himalayas. I’ll send you postcards from all the different places we visit!

Love

Toby

36. According to Paragraph 1, ______.

A. Toby is planning a business trip. B. Toby usually travels in his summer holiday.

C. Colin wants to travel before starting university D. Toby is not very excited about the trip.

37. The underlined “there” refers to _____.

A. the United States B. Morocco C. northern Africa D. the Sahara Desert

38. According to paragraph 2, _____.

A. Toby enjoys the traveling on camels B. Toby is worried about traveling on camels

C. Toby will feed the camels D. Colin loves camels

39. According to Paragraph 5, Toby wants to _____.

A. see a giraffe up close B. scare animals away

C. take photographs animals D. shoot an elephant

40. According to the letter, Toby enjoys _____.

A. comfortable, expensive holidays B. cultural holidays

C. adventure holidays D. staying at home

试题分类