If the population of the earth continues to i...

If the population of the earth continues to increase , there will not be enough resources (资源) left to keep life on the planet. We will use up all the oil that drives our cars sooner or later .One possible way to work out the problem, has recently been suggested by an American scientist, Professor Carl Sagan.

Sagan believes that before the earth’s resources are completely used, it will be possible to change the atmosphere of Venus(金星) and create a new world almost as large as Earth itself. The difficulty is that Venus is much hotter than the earth and there is only a little water there.

Sagan suggests that algae organisms(海藻组织) can live in very hot or cold temperatures and at the same time produce oxygen. They should be bred(养殖) in conditions similar to those on Venus. When this has been done, In a short time, the algae will break down the carbon dioxide into oxygen and carbon.

When the algae have done their work, the atmosphere will become cooler, but before man can set foot on Venus it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for man to land on but the rain will finally fall and in a few years something like earth will be reproduced on Venus.

1.The population growth on Earth will cause the lack(缺乏) of _________.

A.food B.oil C.space D.resources

2.What is one of the difficulties for the human race to live on Venus?

A.The shortage of the algae B.The shortage of carbon

C.The much hotter weather D.The much cooler weather

3.Which of the following statements about the algae is NOT true according to the passage?

A.It can live in very hot temperatures. B.It can live in very cold temperatures.

C.It can break down the carbon dioxide. D.It can provide enough food for man.

4.This passage is mainly about __________.

A.the possibility of living on Venus B.the population of the earth

C.the American scientist Sagan D.the weather of other planets

九年级英语阅读单选困难题查看答案及解析

As the world's population continues to increase, so does the amount of global waste people produce. According to data collected by the World Bank Group, nations are on pace to produce 4 billion tons of waste every year by 2100. Many experts are calling the problem of global waste a worldwide health crisis（危机）because it is ruining the world's oceans, air and soil and endangering the health of all living things.

For years, governments have been telling people that living a zero-waste lifestyle is the way to go. One example of this is what's often called the three R's: reduce, reuse recycle. In that case, less money is spent on waste management. Such positive effects on an economy（经济）as a result of applying the basic rules of reduce, reuse and recycle-is known as a circular economy.

Now some stores are helping people do that. Sometimes, grocery stores produce waste when they throw away food including fruit and vegetables that don't look good any more.In other cases, it's packaged food that is nearing the "sell-by" date printed on the package which is not considered safe to eat. To solve this problem, business people are opening smaller zero-waste stores. Instead of selling food in packages, these stores offer it in open containers. Customers bring their own bags or clean containers to the store. There, they fill their bags or containers with everything from nuts and rice to oil and sauce. They pay for only the amount of each product that they need. Zero-waste stores often sell fruit and vegetables as well. When these goods start to look old, they're sold at a discount or donated to a charity Inspired by these smaller zero-waste stores, some large supermarkets are taking similar steps to reduce the amount of waste that they produce.

By following a circular system, more products than ever are being produced using recycled materials. For example, used tires（轮胎）can be recovered to pave roads, while plastic is reused to make new plastic products. Environmentally-friendly decisions like these help to protect and save natural resources, reduce pollution, save landfill space and even create new job opportunities. Recycling can truly turn garbage into gold.

1.What is the main purpose of the first paragraph？ ______

A.To explain the experts' opinion.

B.To discuss the reason of the problem.

C.To draw people's attention on the problem.

D.To introduce a research of the World Bank Group.

2.We can infer from the passage that ______.

A.grocery stores sell bad-looking food cheaper

B.some supermarkets will sell food without packages

C.governments decided to spend less money on recycling

D.customers will pay for the containers in zero-waste stores

3.Which of the following would be the best title for the passage?

A.Zero Waste, Full Recycle.

B.Less Garbage, More Gold.

C.Global Waste, a Worldwide Crisis.

D.Zero-waste Stores, Garbage Killer.

九年级英语阅读单选中等难度题查看答案及解析

If the population goes on increasing,______in the future.

A. there will be no standing space　　 B. there will be no standing spaces

C. there will have no standing space　　 D. there will be no space standing

九年级英语单选题中等难度题查看答案及解析

— The fact is that there is 　　　 increase in population.

— Yes. Our country has _____ population of 1.3 billion.

A.an, a B.the, a C.an, the D.the, the

九年级英语单选题中等难度题查看答案及解析

The population of Earth is still going up. There will be less and less good land for growing crops in the future. People worry that there will not be enough food for everyone in the middle of this century.

Recently scientists have discovered one strange plant

named fedtschenkoi（玉吊钟）may help. It can absorb（吸收）carbon dioxide(CO₂)

at night. It only needs 10 times less water than food plants like beans. This means it

can grow in the desert(沙漠).

In which ways could this plant help us?

Since deserts are increasing in size because of the changes in Earth’s climate, growing plants there will be more and more important. Although it is dangerous to

eat this plant, scientists can still study something about it: how it absorbs CO₂ at

night while many other plants only do this during the day, and why it is suited to the

desert.

There is another direction to take the research in. Producing a desert plant to eat

will be difficult, but there is still possibility to use the genes(基因)from this plant and put them into food plants.

The other way is to grow this type of plant for fuel(燃料). At the moment we

grow plants for fuel in good land. If we do it in deserts instead, more good land can be used to grow plants for food.

Desert plants have special qualities, which could be an answer to our future food

or energy needs. Scientists are working hard on it.

九年级英语填空困难题查看答案及解析

The population of our city has increased 　　　　 40% compared with 　　　　 of 3 years ago.

A. by; that　　 B. to; those

C. with; ones　　 D. of; it

九年级英语单选题中等难度题查看答案及解析

If you are one of those who want to know how to increase your vocabulary, there are some ways you may find useful. In fact, it is not that difficult to learn new words, but to remember them for a lifetime seems not to be so easy.

To make it easier, you can try word associations（联想）. Try to find a connection between a new word and things or people you know. For example, if your neighbour is an unselfish person who cares about the needs of other people, think about this person every time you see the word, and very soon you'll start actively using it.

Try to use the words you learn as often as possible. Perhaps you are not sure which situations they should be used in, or whether you pronounce（发音） them correctly, but practice is the best way to understand that. It is not enough to find out the meaning of a word. You should hammer (敲打) it into your mind by using it in actual conversations in everyday life.

Also, it may be helpful to know the meaning of the word roots, prefixes (前缀) and suffixes　 （后缀）， especially if they have a Greek or Latin origin（起源）． Even if you meet a long unfamiliar word, it will be easy to know its meaning if you know the general meaning of its parts.　 For example, if you see the word "philanthropy", it won't be difficult to surmise what it means if you know that "anthropo" means "human" and "philo" means "loving". Not only can ancient Greek and Latin be helpful, but a number of modern languages as well. So, if you speak French,　 Italian, Spanish or Portuguese, guess the meaning of an unfamiliar English word if it sounds like　 a word from another language you know.

1. Which of the following old sayings can show the main idea of Paragraph 3?

A. Every dog has his day.

B. Practice makes perfect.

C. Every coin has two sides.

D. Where there is a will there is a way.

2. According to the last paragraph, what does the writer think is important?

A. Learning to use several different modern languages.

B. Learning some very difficult words in the English language.

C. Knowing the meaning of the word roots, prefixes and suffixes.

D. paying more attention to words that have a Greek or Latin origin.

3.The underlined word "surmise" in the last paragraph means_______.

A. guess　　         B. suggest　　

C. prove　　     　　 D. remember

4. what's the writer's purpose in writing the passage?

A. To tell us how he or she learnt English well.

B. To explain why it is not hard to learn new words.

C. To prove that learning new words can be really fun.

D. To tell us some good ways of remembering new words.

九年级英语阅读理解中等难度题查看答案及解析

If the lake continues to be protected, ________more fish in it over the next several years.

A.there are B.there will be C.there were D.there have been

九年级英语单选题中等难度题查看答案及解析

I'm afraid that Rare Earth(稀土) will 　　　　 if we continue to waste it．

A. run out　　 B. break out　　 C. come down　　 D. fall down

九年级英语单项填空中等难度题查看答案及解析

Wild animals are important to us. They live 1. with us on the earth. If there are no animals on the earth, we will not live on, 2.. So we should take good care of them to help the earth live a 3. life.

But some people still don’t realize the importance of protecting them. They kill wild animals for food and 4.. Every day many wild animals are being killed. So far, lots of wild animals　 5.. If this goes on, there will be no animals 6. on the earth.

7., many people have begun to realize the importance of protecting wild animals. They ask others to stop 8. wild animals. Now many countries have made some laws to protect wild animals and to stop people from killing them.

Protecting wild animals is the duty of each of us. We should do our 9. to protect them because protecting them is protecting 10. too.

九年级英语选词填空困难题查看答案及解析