Animals can move from place to place, but plants cannot. When an animal is under attack, it can run away or fight back. Plants certainly cannot run away, and they lack teeth and claws. But plants can defend themselves by using both physical and chemical means.
Some plants have their own ways to keep animals away. For example, the leaves of the holly plant have sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches. This is because the lower leaves are easier for most animals to reach.
Some plants, such as the oak tree, have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal's teeth.
Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar (毛虫) bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine. The higher levels of nicotine discourage the caterpillar.
Many plants depend on both physical and chemical defenses. A certain plant in China, for instance, has prickly (多刺的) leaves, and each prickle contains poisonous venom (毒液). A single experience with this kind of plant will teach an animal to stay away from it in the future.
1.The holly plant has more spines on the lower leaves because most animals________.
A.are not tall enough B.like the lower leaves only
C.are not clever enough D.can get the lower leaves easily
2.To defend themselves, oak trees use________.
A.chemical means B.physical means
C.bitter chemicals D.sandy materials
3.How does tobacco protect itself against an attack from a caterpillar?
A.Its leaves fight against the attack by physical means.
B.Its roots send a messenger to discourage the caterpillar.
C.Its roots increase the production of nicotine when it is attacked.
D.Its leaves produce poisonous sand to drive the caterpillar away.
4.What would be the best title for this passage?
A.Plants and Animals B.How Plants Defend Themselves
C.Attacks and Defenses D.How Animals Eat Plant Leaves
高三英语阅读理解中等难度题
Animals can move from place to place, but plants cannot. When an animal is under attack, it can run away or fight back.. Plants certainly cannot run away, and they lack teeth and claws. But plants can defend themselves by using both physical and chemical means.
Some plants have their own ways to keep animals away. For example, the leaves of the holly plant have sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches. This is because the lower leaves are easier for most animals to reach..
Some plants, such as the oak tree, have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal's teeth.
Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar (毛虫) bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine. The higher levels of nicotine discourage the caterpillar.
Many plants depend on both physical and chemical defenses. A certain plant in China, for instance, has prickly (多刺的) leaves, and each prickle contains poisonous venom (毒液) A single experience with this kind of plant will teach an animal to stay away from it in the future.
1.The holly plant has more spines on the lower leaves because most animals________.
A. are not tall enough B. like the lower leaves only
C. are not clever enough D. can get the lower leaves easily
2.To defend themselves, oak trees use________.
A. chemical means B. physical means
C. bitter chemicals D. sandy materials
3.How does tobacco protect itself against an attack from a caterpillar?
A. Its leaves fight against the attack by physical means.
B. Its roots send a messenger to discourage the caterpillar.
C. Its roots increase the production of nicotine when it is attacked.
D. Its leaves produce poisonous sand to drive the caterpillar away.
4.What would be the best title for this passage?
A. Plants and Animals B. How Plants Defend Themselves
C. Attacks and Defenses D. How Animals Eat Plant Leaves
高三英语阅读理解中等难度题查看答案及解析
Animals can move from place to place, but plants cannot. When an animal is under attack, it can run away or fight back. Plants certainly cannot run away, and they lack teeth and claws. But plants can defend themselves by using both physical and chemical means.
Some plants have their own ways to keep animals away. For example, the leaves of the holly plant have sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches. This is because the lower leaves are easier for most animals to reach.
Some plants, such as the oak tree, have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal's teeth.
Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar (毛虫) bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine. The higher levels of nicotine discourage the caterpillar.
Many plants depend on both physical and chemical defenses. A certain plant in China, for instance, has prickly (多刺的) leaves, and each prickle contains poisonous venom (毒液). A single experience with this kind of plant will teach an animal to stay away from it in the future.
1.The holly plant has more spines on the lower leaves because most animals________.
A.are not tall enough B.like the lower leaves only
C.are not clever enough D.can get the lower leaves easily
2.To defend themselves, oak trees use________.
A.chemical means B.physical means
C.bitter chemicals D.sandy materials
3.How does tobacco protect itself against an attack from a caterpillar?
A.Its leaves fight against the attack by physical means.
B.Its roots send a messenger to discourage the caterpillar.
C.Its roots increase the production of nicotine when it is attacked.
D.Its leaves produce poisonous sand to drive the caterpillar away.
4.What would be the best title for this passage?
A.Plants and Animals B.How Plants Defend Themselves
C.Attacks and Defenses D.How Animals Eat Plant Leaves
高三英语阅读理解中等难度题查看答案及解析
Some animals carry seeds from one place to another, ______ plants can spread to new places.
A. so B. or
C. for D. but
高三英语单项填空中等难度题查看答案及解析
Those farmers who _________ move from place to place with their animals in the past have moved into new houses at last.
A. could B. might C. would D. should
高三英语单项填空简单题查看答案及解析
Those natives who _________ move from place to place with their animals in the past have moved into new houses at last.
A. could B. would C. might D. should
高三英语单项填空中等难度题查看答案及解析
Those farmers who _________ move from place to place with their animals in the past have moved into new houses at last.
A. could B. might C. would D. should
高三英语单项填空中等难度题查看答案及解析
Those farmers who _________ move from place to place with their animals in the past have moved into new houses at last.
A. could B. might C. would D. should
高三英语单项填空中等难度题查看答案及解析
Many animals move from one place to another at certain times of the year. This annual movement is called migration. They migrate to find food, seek a partner, or in search of warmer weather. One of the most wonderful migrations in nature is that of the North American monarch butterfly.
Every autumn, millions of these beautiful insects with fine black and orange wings begin a long and difficult journey. Somehow they manage to travel around 4, 000 kilometers south and find their way to California or Mexico. However, until recently no one knew how they did this.
A team of scientists led by Professor Eli Shlizerman at the University of Washington has now found the answer. They have found out that the monarch is able to tell the time of day. It uses its eyes to measure the position of the sun. These two pieces of information—the time of day and the point where the sun is in the sky—allow the butterfly to determine the way to go. Eventually, it manages to reach the places where it will spend the winter.
The solution to the mystery of the monarch’s amazing ability comes at a time when it is in serious trouble. Its population has crashed by as much as 90 per cent in the last few years. Sadly, human activity is the main reason why the number of monarch butterflies is falling. In many of the places where the butterfly can be found, people are destroying the natural environment. They cut down trees and use chemicals that kill the plants that monarch caterpillars eat.
The research on the monarch’s behavior has however led to a greater awareness of this creature. People have been working together to record its migration and make sure that there are enough plants for it to feed on. If this works, there may come a time when the number of monarch butterflies increases once again. The more we know about this lovely creature, the greater the chance it will survive and keep its place in the natural world for a long time to come.
1.Which is not the purpose of animals’ migration according to the text?
A.To search for food. B.To look for a partner.
C.To breed young babies. D.To stay away from cold weather.
2.What mainly caused the decrease in the number of the monarch butterflies?
A.Weather changes. B.Human activities.
C.Trees being cut down. D.The long migration every year.
3.What can we know from the text?
A.All the animals migrate at fixed times of the year.
B.The monarch has the ability to identify the time of day.
C.The population of the monarch is decreasing rapidly every year.
D.No one knows how the monarch butterflies make their way to their destinations.
4.What does the last paragraph imply about the research?
A.It is quite encouraging. B.it is fairly complex.
C.It is very unacceptable. D.It is rather useless.
高三英语阅读理解简单题查看答案及解析
Many countries are now setting up national parks ________ animals and plants can be protected.
A. when B. which
C. whose D. where
高三英语单项填空中等难度题查看答案及解析
Because plants cannot move or talk, most people believe that they have no feelings and that they cannot receive signals from outside. However, this may not be completely true.
People who studied plants have found out that plants carry a small electrical charge (电荷). It is possible to measure this charge with a small piece of equipment called “galvanometer”. The galvanometer is placed on a leaf off the plant, and it records any changes in the electrical field of the leaf. Humans have a similar field which can change when we are shocked or frightened.
A man called Backster used a galvanometer for his studies of plants and was very surprised at his results. He found that if he had two or more plants in a room and he began to destroy one of them - perhaps by pulling off its leaves or by pulling it out of its pot - then the galvanometer on the leaves of the other plants showed a change in the electrical field. It seemed as if the plants were signalling a feeling of shock. This happened not only when Backster started to destroy plants, but also when he destroyed other living things such as insects (昆虫).
Backster said that the plants also knew if someone had destroyed a living thing some distance away, because they signalled when a man who had just cut down a tree entered the room.
Another scientist, named Sauvin, achieved similar results to Backster’s. He kept galvanometers fixed to his plants all the time and checked regularly to see what the plants were doing. If he was out of the office, he telephoned to find out about the signals the plants were sending. In this way, he found that the plants were sending out signals at the exact times when he felt strong pleasure or pain. In fact, Sauvin could cause a change in the electrical field of his plants over a distance of a few miles simply by thinking about them.
1.Backster was surprised at the results of his studies because _____.
A.he destroyed an insect |
B.he destroyed a plant by pulling off its leaves |
C.he found that plants could express feelings of shock |
D.he found that plants could move and speak after all |
2.The plants sent out signals _____.
A.only when Backster Started to destroy plants |
B.when Backster destroyed plants or other living things |
C.only when he destroyed things such as insects |
D.only when Backster placed the galvanometer on the leaves of the plants |
3.The scientist called Sauvin _____.
A.did not agree with Backster’s ideas |
B.did not get the same sort of results as Backster did |
C.got different results from Backster’s |
D.found out some of the same things that Backster did |
4.Which of the following is true according to the passage?
A.The electrical charge plants carry may shock or frighten us. |
B.A tree will signal when it has been cut down. |
C.Sauvin could make his plants send out signals some distance away. |
D.Plants have feelings because they can receive signals without moving. |
高三英语阅读理解中等难度题查看答案及解析