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When you watch TV programmes about wild animals, it is amazing to see how an antelope can escape a lion’s attack. In the wilderness, everyone has a stunt(绝技). Even plants have their own ways of fighting off enemies.
Over millions of years of evolution, plants have developed a unique defence system. Chemicals are widely used for survival, By making their leaves, flowers, stems, roots and fruits distasteful or poisonous to predators(食肉动物), plants can fight back.
One such plant is the Gold Wattle tree. British botanist David Cameron has found that when an animal eats the tree’s leaves, the amount of poisonous tannin(丹宁酸) increases in the other leaves. “It’s like the damaged leaves telephoning the others telling them to fight together against the enemy,” he said.
The tree also sends defence messages to neighboring plants by giving out a special smell. Golden Wattle tress in the surrounding 45 meters will get the message and produce more tannin within 10 minutes. Now, if a predator eats too many of the trees’ leaves, it will die.
Every species of plant or tree specializes in the production of a particular set of chemicals. A herbivore(草食动物) that can safely eat the leaves of one tree may be poisoned by its neighbor.
In this way, plants have developed not only individual defence systems, but also shared it with others. This makes it impossible for a single predator to destroy even a small area of forest.
1．According to the passage, which of the following statements about the Golden Wattle tree is NOT correct?
A．It is only poisonous while it is being attacked.
B．It has the ability to warn its neighboring plants of danger.
C．It fights off its enemies by producing poisonous chemicals.
D．An animal that eats too many of its leaves may be poisoned to death.
2．It is impossible for a single predator to destroy even a small area of forest mainly because ___.
A．plants will become poisonous if they are attacked.
B．plants have very good individual defence systems.
C．plants can protect themselves and share their defence systems.
D．plants can give out special smell to fight off their enemies.
3．What does David Cameron mean in paragraph 3?
A．He means that leaves of Golden Wattle trees can speak to each other.
B．He intends to emphasize that the defence system of Golden Wattle is quick and effective.
C．He wants to indicate that the Golden Wattle leaves are very clever.
D．He is explaining how the Golden Wattle tress warn each other when they are attacked.
4．According to the writer, the unique defence system of plants is the result of ______.
A．millions of years of evolution.
B．the tough natural environment.
C．their outstanding poison producing system.
D．large numbers of herbivores in the wilderness.
5．From the passage, we learn that __________.
A．All the plants or trees are poisonous.
B．Every plant or tree produces its particular chemicals.
C．All the plants or trees produce the same chemicals.
D．Every species of plant or tree produces its particular chemicals.
查看习题详情和答案>>Bamboo flooring（竹地板）is a growing trend in home flooring and is also a great improvement to traditional hardwood floors．It is the most environmentally friendly kind of natural flooring that you can select for your home．It is also a renewable（可再生的）resource,is stronger than steel,and does not suffer from problems as a result of temperature changes．
Bamboo is one of the fastest growing plants on earth,and only takes five years to grow to adult form．Bamboo is harvested every five years,and starts to re-grow immediately after being harvested．For this reason,bamboo is a kind of grass,not a tree．Bamboo is hollow（空心的）but very hard and can stand up to 50,000 pounds of pressure per square inch．
Bamboo flooring has become very popular with its rich and beautiful golden earth colors．But it is important to shop around for a good-quality bamboo flooring product that contains no formaldehydes（甲醛）,which is said to be the best kind of bamboo flooring．Many brands use cheaper bamboo that may contain formaldehydes,and this can cause indoor air pollution problems as certain chemical materials in the bamboo slowly release their pollutants into the air．
So,why should we turn to bamboo to save the enviroment?In fact,bamboo cannot save the environment directly,but it is an excellent replacement product for much of the hardwood species of trees that are being harvested in rainforests．Once harvested,if these hardwood trees do grow back,it can take up to 200 years!Rainforests are the lungs of our planet and they make a significant contribution to global oxygen production．学科网
By selecting bamoo flooring,you can reduce the demand for hardwood materials and help save the environment for future generations．Of course,everyone wants to buy good-quality bamboo flooring．The brands（品牌）from our shop are very high in quality and have received a lot of public praise．
- 1.
Bamboo is a kind of grass because _______．
- A.it grows quickly
- B.it isn’t as high as a tree
- C.it doesn’t grow in forests
- D.it is hollow
- A.
- 2.
What kind of bamboo flooring is best?
- A.The strongest kind．
- B.The most expensive kind．
- C.The kind that has a beautiful color．
- D.The kind that contains no formaldehydes．
- A.
- 3.
How can bamboo make a contribution to the environment?
- A.It can directly improve the environment．
- B.It does not release formalddehydes at all．
- C.It can replace hardwood tree products．
- D.It can produce a lot of oxygen．
- A.
- 4.
The author wrote this passage in order to _______．
- A.explain the importance of bamboo flooring
- B.tell us his or her own bamboo flooring brands are good
- C.tell people to care more about the environment
- D.discuss the history of hardwood flooring
- A.
Bamboo flooring（竹地板）is a growing trend in home flooring and is also a great improvement to traditional hardwood floors．It is the most environmentally friendly kind of natural flooring that you can select for your home．It is also a renewable（可再生的）resource,is stronger than steel,and does not suffer from problems as a result of temperature changes．
Bamboo is one of the fastest growing plants on earth,and only takes five years to grow to adult form．Bamboo is harvested every five years,and starts to re-grow immediately after being harvested．For this reason,bamboo is a kind of grass,not a tree．Bamboo is hollow（空心的）but very hard and can stand up to 50,000 pounds of pressure per square inch．
Bamboo flooring has become very popular with its rich and beautiful golden earth colors．But it is important to shop around for a good-quality bamboo flooring product that contains no formaldehydes（甲醛）,which is said to be the best kind of bamboo flooring．Many brands use cheaper bamboo that may contain formaldehydes,and this can cause indoor air pollution problems as certain chemical materials in the bamboo slowly release their pollutants into the air．
So,why should we turn to bamboo to save the enviroment?In fact,bamboo cannot save the environment directly,but it is an excellent replacement product for much of the hardwood species of trees that are being harvested in rainforests．Once harvested,if these hardwood trees do grow back,it can take up to 200 years!Rainforests are the lungs of our planet and they make a significant contribution to global oxygen production．
By selecting bamoo flooring,you can reduce the demand for hardwood materials and help save the environment for future generations．Of course,everyone wants to buy good-quality bamboo flooring．The brands（品牌）from our shop are very high in quality and have received a lot of public praise．
67．Bamboo is a kind of grass because _______．
A．it grows quickly B．it isn’t as high as a tree
C．it doesn’t grow in forests D．it is hollow
68．What kind of bamboo flooring is best?
A．The strongest kind． B．The most expensive kind．
C．The kind that has a beautiful color． D．The kind that contains no formaldehydes．
69．How can bamboo make a contribution to the environment?
A．It can directly improve the environment．
B．It does not release formalddehydes at all．
C．It can replace hardwood tree products．
D．It can produce a lot of oxygen．
70．The author wrote this passage in order to _______．
A．explain the importance of bamboo flooring
B．tell us his or her own bamboo flooring brands are good
C．tell people to care more about the environment
D．discuss the history of hardwood flooring
查看习题详情和答案>>Sonoma County, California is famous for its natural beauty. The area is also known for its fruits, vegetables, eggs, and seafood. When I first moved to the area years ago, I had no idea I would be living in such a rich area!
After the summer, local festivals practically celebrate the richness of the county every weekend. From Egg Days, Tomato Festival to Seafood Festival, Sonoma County has something for everyone. An event held every year is one of the most special in the area, which celebrates the harvest(收获) of tomatoes, showing over 170 kinds of this tasty fruit. Cooks prepare the most favorite tomato-inspired dishes. You can enjoy all kinds of food while listening to live music, and taste the world famous Kendall Jackson wine.
Another great feature of this event is the opportunity to take part in the yearly competition with your own tomatoes. Tomatoes are judged (判断) on looks, taste, and weight and winners will be awarded (奖励). If you’re planning on visiting and want to attend this event, get your ticket early as it sells out quickly.
This year, to celebrate Tomato Festival, I decided to plant a few tomatoes in a wine barrel (桶) that had kept a lemon tree before. The tree, after about 6 years, finally did not produce fruits anymore, so I changed to plant 3 tomato plants instead. The three wine barrel plants stand over six feet tall and that’s above the top of the barrel! They have lots of flowers and some have started to produce fruits. As usual, harvest may be late this year, but the quality of my tomatoes will be excellent. I believe I’ll realize my dream of being the best tomato gardener
- 1.
We can know from the first two paragraphs that
- A.the author didn’t live there long
- B.Sonoma County lies by the sea
- C.people there like drinking wine
- D.there are celebrations every day
- A.
- 2.
The passage mainly tells us something about
- A.Egg Days
- B.Seafood Festival
- C.Tomato Festival
- D.Vegetable Days
- A.
- 3.
If you are the best tomato gardener you will
- A.be given prizes as a winner
- B.eat tomato dishes for free
- C.be respected by the local people
- D.drink Kendall Jackson wine free
- A.
Sonoma County, California is famous for its natural beauty. The area is also known for its fruits, vegetables, eggs, and seafood. When I first moved to the area years ago, I had no idea I would be living in such a rich area!
After the summer, local festivals practically celebrate the richness of the county every weekend. From Egg Days, Tomato Festival to Seafood Festival, Sonoma County has something for everyone. An event held every year is one of the most special in the area, which celebrates the harvest(收获) of tomatoes, showing over 170 kinds of this tasty fruit. Cooks prepare the most favorite tomato-inspired dishes. You can enjoy all kinds of food while listening to live music, and taste the world famous Kendall Jackson wine.
Another great feature of this event is the opportunity to take part in the yearly competition with your own tomatoes. Tomatoes are judged (判断) on looks, taste, and weight and winners will be awarded (奖励). If you’re planning on visiting and want to attend this event, get your ticket early as it sells out quickly.
This year, to celebrate Tomato Festival, I decided to plant a few tomatoes in a wine barrel (桶) that had kept a lemon tree before. The tree, after about 6 years, finally did not produce fruits anymore, so I changed to plant 3 tomato plants instead. The three wine barrel plants stand over six feet tall and that’s above the top of the barrel! They have lots of flowers and some have started to produce fruits. As usual, harvest may be late this year, but the quality of my tomatoes will be excellent. I believe I’ll realize my dream of being the best tomato gardener.
1.We can know from the first two paragraphs that .
A．the author didn’t live there long
B．Sonoma County lies by the sea
C．people there like drinking wine
D．there are celebrations every day
2.The passage mainly tells us something about .
A．Egg Days B．Seafood Festival
C．Tomato Festival D．Vegetable Days
3.If you are the best tomato gardener you will .
A．be given prizes as a winner B．eat tomato dishes for free
C．be respected by the local people D．drink Kendall Jackson wine free
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