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
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
_____from other continents for millions of years, Australia has many plants and animals not found in any other country in the world.
A. Being separated B. Having separated
c. Having been separated D. To be separated
高三英语单项填空中等难度题查看答案及解析
Plants are living things. So can they feel pain? Plants don't feel pain the same way animals and people do, says Anke Steppuhn. She is a scientist at the Free University of Berlin in Germany. “What we define as pain usually has to do with a nervous system，” Steppuhn explains. When you put your hand too close to a hot stove, nerve cells send a signal to your brain. Your brain decodes(解码) that signal as pain. This causes you to pull your hand away before any serious damage is done.
Plants don't have nerves or brains, so they can't feel pain like we do. “But plants do recognize when something is hurting them，” Steppuhn says. Because they are rooted to the ground, they can't escape a dangerous situation. So they need other ways of fighting back.
The biggest threat to a plant's life is getting eaten. Some plants grow sharp little hairs. Other plants produce bad－tasting or even harmful chemicals. These force an attacker to abandon its meal. A plant called bittersweet nightshade does something even smarter, Steppuhn found. When a slug(蛞蝓) chews holes in a nightshade' s leaf, liquid begins dripping(滴) around the wound. It is almost as if the plant were bleeding. The liquid is sugary nectar(花蜜), and it happens to be a favorite food of ants. In their effort to collect the nectar, the ants swarm(蜂拥而至) all over the injured plant. They will attack anything that stands in their way. That includes the slug that damaged the plant in the first place. It's a very clever trick. Whenever a slug attacks a plant, the plant calls an army of ants to kill the slug.
Nectar isn't the only way plants attract bodyguards. They also release certain chemicals into the air when they are being eaten. People usually can't detect these smells. But wasps(黄蜂) can. When a wasp detects this cry for help, it races to the scene of the crime. If it finds the right kind of insect chewing down on the plant, the wasp will interrupt the attacker's meal. It will do this by laying eggs inside the insect’s body!
1.Why do plants feel pain differently from us?
A. They don’t know whether they're hurt.
B. They face different kinds of danger.
C. They don’t have nervous systems.
D. They have slow response to pain.
2.What does the underlined word “They” in Paragraph 3 refer to?
A. Ants. B. Slugs. C. Plants. D. Wasps.
3.Why do some plants need wasps?
A. To help them call bodyguards.
B. To keep them safe from attackers.
C. To let wasps lay eggs on their leaves.
D. To let their smells spread into the air.
4.What is the text mainly about?
A. How plants feel pain.
B. How plants attract insects.
C. How plants defend themselves.
D. How plants attack small animals.
高三英语阅读理解中等难度题查看答案及解析
We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another at a certain time. They move for different reasons: most of them move to find food more easily, but others move to get away from places that are too crowded.
When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration(迁移) is probably the migration of the fish, which is called “salmon”. This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies there. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea.
Recently, scientists have studied the migration of a kind of lobster(龙虾). Every year, when the season of bad weather arrives, the lobster get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where they go.
So, sometimes we know why humans and animals move from one place to another, but at other times we don’t. Maybe living things just like travel.
1.Most animals move from one place to another at a certain time to _____.
A. give birth B. enjoy warmer weather
C. find food more easily D. find beautiful places
2.The mice in northern Europe move when _____.
A. they need fresh water B. the weather is bad
C. the place gets too crowded D. they haven’t enough food
3.This passage is mainly about _____.
A. why animals move from one place to another B. how animals can find food easily
C. new discoveries of animals traveling D. some problems with traveling
高三英语阅读理解简单题查看答案及解析
_________ from other continents for millions of years, Australia has many plants and animals not found in any other country in the world.
| A．Being separated | B．Having separated |
| C．Having been separated | D．To be separated |
高三英语单项填空困难题查看答案及解析
Besides providing a perfect environment for sea plants and animals to live in, seawater has other values, one of which is that it constantly moves, and its movements produce energy.
The most obvious movements are the waves and the tides. Winds cause the waves, and the gravitational pull of the moon and the sun causes the tides. In places like the Bay of Fundy in Canada, the difference between the high and low tide level can be as much as 40 feet.
France and Britain are now trying to use energy in the tides to produce electricity. Waves can produce electricity and some experiments are taking place to learn more about this. One of the most encouraging areas of research uses the difference between the temperature of seawater at the surface and deep down to produce electricity.
1.Waves and tides are caused by ________ .
| A．the same forces | B．different forces | C．their own movements | D．plants and animals |
2.It can be inferred from the passage that __________ .
| A．waves as well as the energy in the tide can produce electricity |
| B．the highest tide is 40 feet higher than the lowest one at the sea |
| C．many countries in the world have made the most of energy produced by seawater |
| D．it is being tried in some developed countries to use energy in the tides to produce electricity |
3. The best title for the passage is ______.
| A．Tides and Waves | B．How to Produce Electricity | C．Seawater | D．Another Cheap Energy |
高三英语阅读理解中等难度题查看答案及解析
Today, many species of animals and plants are endangered. This means they are in danger of becoming extinct and living on only in the pages of history books. The famous dodo is a classic example of a creature that became extinct. A flightless bird that lived on the island of Mauritius, it was discovered by sailors in 1598 but was hunted to extinction by 1681.
Hunting has caused the Bengal tiger and the African elephant to be endangered today but habitat destruction can also lead to extinction. This is equally true for plants. Animals and plants disappear for other reasons too, but the main cause is often a disruption（打乱，破坏） in the natural food chain, whether due to hunting, habitat destruction, or even the introduction of alien species.
The natural food chain is the cycle that governs the existence of all life on this planet. It is a carefully balanced cycle and any imbalance that occurs can cause knock-on effects that have serious consequences. At the beginning of the natural food chain are plants which turn sunlight into energy and draw nutrients from the earth. Plants are called producers.
After the producers come the consumers. There are three tiers of consumers. First are creatures such as plant-eating animals, fish and insects which feed off the producers. These animals that only eat plants are called herbivores. The second tier of consumers are carnivores - animals that live off other animals. The third tier of consumers eats both other animals and plants. These consumers, including most humans, are called omnivores.
After animals and plants die, they become food for other smaller creatures, such as bacteria and some plants, such as fungi. As they feed, these creatures turn the dead bodies back into gases and minerals which are again food for the producers at the beginning of the food chain. And so the cycle continues.
All of nature is connected and governed by hundreds of these delicate food chains and if a single plant in the chain cannot survive, then the insects that live off the plant start to die and the animals that eat the insects also start to die.
When a food chain is disrupted, the consequences can be extremely serious. One estimate suggests that for each plant species that is lost, up to 30 animals and insects may also die out. One wonders how many species were affected by the extinction of the dodo?
Humans can have disastrous effects on food chains. We've already mentioned hunting but now let's look at travel. When people first started to explore the world they took plant and animal species from their home countries and introduced them wherever they went. They didn't realize that by introducing alien species they were disrupting the natural food chains of the areas they discovered. Although there are strict rules in place today controlling the import and export of alien species, some places are still fighting the effects of aliens introduced hundreds of years ago.
For example, Gough Island in the South Atlantic Ocean is a breeding ground for albatrosses that have been nesting there for centuries. But in the 19th century, mice from passing ships were brought to the island. Being a species alien to the island, they had no natural predators and have now grown to such a size that they are attacking and killing albatross chicks. If they are allowed to continue, they will wipe out the albatross population.
With import laws and people's rising awareness of how humans affect the natural environment, hopefully we can learn to fit better into the natural food chains that govern our world. Otherwise we need to accept that the loss of any more plants and animals could eventually mean our own extinction.
1.What do the first two paragraphs mainly tell us?
A. Hunting and habitat destruction lead to extinction.
B. Many species of animals and plants are endangered.
C. Plants and animals become extinct for the same reasons.
D. The main cause of extinction is often a disruption in the natural food chain.
2.Which of the following sentence is TRUE according to the passage?
A. Strict rules alone can remove the bad effects of alien species.
B. Plants, herbivores and carnivores are the three tiers of consumers.
C. If a bird becomes extinct, the relevant food chain will be disrupted.
D. Animals and plants become extinct because alien species are imported.
3.By mentioning the mice in Gough Island, the author intends to highlight ______.
A. mice worldwide are growing all the time
B. being aliens, they had no natural predators
C. some places are still fighting the effects of aliens
D. traveling can have disastrous effects on food chains
4.What is the best title of the passage?
A. Survival of the fittest.
B. Endangered animals and plants.
C. How to protect the natural environment.
D. The link between food chains and extinction.
高三英语阅读理解中等难度题查看答案及解析
---How far do they live apart?
---________I know, they live in the same neighborhood.
A．As long as B．As well as C．As far as D．As soon as
高三英语单项填空中等难度题查看答案及解析
---How far do they live apart?
---________I know, they live in the same neighborhood.
A．As long as B．As well as C．As far as D．As soon as
高三英语单项填空中等难度题查看答案及解析
------How far apart do they live?
-----________I know, they live in the same neighbourhood．
A. As long as B. As tar as C. As well as D. As often as
高三英语单项填空中等难度题查看答案及解析