They eat only plant foods, and take care to _...

They eat only plant foods, and take care to ________ animal products from other areas of their lives．

A．contain　　　　 B．maintain

C．exclude　　　　 D．Include

高三英语单项填空中等难度题查看答案及解析

They eat only plant foods, and take care to ________ animal products from other areas of their lives．

A． contain　　　　 B． maintain

C． exclude 　　　　 D． Include

高三英语单项填空困难题查看答案及解析

They eat only plant foods, and take care to ________ animal products from other areas of their lives．
A． contain　　　　 B． maintain

C． exclude　　　　 D． Include

高三英语单项填空中等难度题查看答案及解析

They eat only plant foods, and take care to ________ animal products from other areas of their lives.

A. contain　　 B. maintain　　 C. exclude　　 D. Include

高三英语单项填空中等难度题查看答案及解析

Plants and animals usually do not live apart, as in many ways they are important to each other. Most green plants can make their own food. The food of other living things, even the food of meat-eating animals, comes directly or indirectly from green plants. For example, some people eat mutton (羊肉); mutton comes from a goat; the goats eat grass. These steps, or links, make up what is called a food chain. Without green plants, all other living things would in time die of starvation.

Plants help animals in other ways too. They furnish homes and shelter for many animals. Many birds, as you know, build their nests in trees. Deer and many other animals use bushes for shel­ter. And even man depends much upon plants for his shelter. Animals repay some of this debt by helping plants. You may be aware that many insects and some birds do important work for plants by pollinating (授粉) them. You must have also learned how animals often help plants by spreading seeds.

What is waste material for one of these kinds of life is often valuable substance for the other. For example, animals give off carbon dioxide gas when they breathe. When plants make food, they absorb this gas from the air, using the carbon and releasing some of the oxygen back into the air. The oxygen that is released, then, is again supplied to animals. Thus the cycle continues, ani­mals helping plants, and plants helping animals.

All plants and animals have their enemies. Insects eat plants; birds eat insects; other animals kill birds. But here too, animals such as birds and bats help the plants by destroying harmful in­sects. Many plants and animals are helpful to some living things but are harmful to others. Then there are other rules in nature that act as checks and balances. For example, if there are more animals in a certain area than there is food to support them, some of the animals must mi­grate or starve. In either case, the number of animals will be reduced until the balance between animals and the available food supply is restored.

These helps and hindrances (障碍) are constantly going on in the plant and animal world to achieve a balance. As long as one living thing is dependent on another, whenever the scales are tipped (使倾斜), nature takes steps to balance the scales again.

(Note: Answer the questions or complete the statements in NO MORE THAN TEN WORDS.)

1.What does the author mean by saying “Plants and animals usually do not live apart”?

2.Besides providing food and shelter for animals, plants can also ______ to help animals to live.

3.“Checks and balances” refers to ______ in the world of animals and plants.

4.What will be the final result if some animals migrate or starve for lack of food?

高三英语其他题中等难度题查看答案及解析

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．

1.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

2.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

3.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．

4.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

高三英语阅读理解中等难度题查看答案及解析

____you eat the correct foods _____be able to keep fit and stay healthy．

A．Only if ; will you                   B．Only if ;you will

C．Unless ; will you            D．Unless ; you will

高三英语单项填空中等难度题查看答案及解析

_____there are many different types of food, some animals spend their lives eating only one type.

A. Since　 B. As　　 C. Despite　　 D. While

高三英语单项填空中等难度题查看答案及解析

______ you eat the correct foods ______ be able to keep fit and stay healthy.

A. Only if; you will   B. Unless; you will   C. Only if; will you    D. Unless; will you

高三英语单项填空中等难度题查看答案及解析

______ you eat the correct foods ______ be able to kiip fit and stay healthy．

A．Only if; you will                           B．unless; you will

C．Only if; will you                           D．unless; will you

高三英语单项填空困难题查看答案及解析