It is high time that we ____ the amount of ca...

It is high time that we ____ the amount of carbon dioxide in our daily life.

A. reduce     B reduced    C will reduce   D reduces

高二英语单项填空中等难度题查看答案及解析

It is pretty well understood_______ controls the flow of carbon dioxide in and out the atmosphere today.

A. what　　　　　　　　　 B. when　　　　　　　　 C. that　　　　　　 D. how

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In the last decade, disasters have become increasingly common. It’s high time that we ______these issues more seriously.

高二英语单项填空简单题查看答案及解析

Scientists are increasely _____ that the earth is getting hotter because of carbon dioxide and other gases.

A. content　         B. conscious         C. convinced　         D. common

高二英语单项填空中等难度题查看答案及解析

We all know that forests-especially rainforests-absorb carbon dioxide and produce the oxygen that all living things depend on. It’s no wonder that they have been named the lungs of the planet. Today, after the big fires in the Amazon, Alaska, Greenland, and even Siberia, it’s very clear that we need to grow a forest that is fireproof. That’s not an impossible dream. We can grow seaweed forests that are fireproof because they are underwater.

Seaweed can store carbon and help reduce the influence of global warming. Now, seaweed is being farmed in small ocean farms to be used for food, medicines, and beauty products. If seaweed can be grown on a large scale(大规模地), it could help to fight against global warming.

“Seaweed is finally having its moment in the spotlight,” said Halley Froehlich, a scientist at the University of California. She is the lead author of a new study published in Current Biology. The study shows that large-scale seaweed farming could be used to cancel out land-based carbon emissions and it mapped the areas of the oceans where seaweed could be grown.

Now, only 3.8 percent of the US waters off the coast of California are being used to grow seaweed but that is just 0.065 of the ocean that can be farmed. In fact, 48 square kilometers of the world’s oceans can be used for seaweed farming.

For seaweed farms to be part of the global solution, they will have to be much larger. To create underwater forests, seaweed would have to be grown, harvested and then sunk into the deep ocean so that the trapped carbon could be buried for years to come.

While it sounds like a good plan on paper, “The technology doesn’t yet exist” to keep seaweed in the deep ocean, said Froehlich. “Hopefully this paper encourages conversation among engineers and economists about what it would take for the actual tools to be put in place.”

1.What makes people put forward the idea of growing seaweed forests?

A.The burning of forests.

B.Seaweed’s economic and medical value.

C.Uncontrollable carbon dioxide emissions.

D.Their long-lasting dream of underwater exploration.

2.Why can seaweed be used to fight against global warming?

A.It doesn’t burn. B.It doesn’t pollute.

C.It can take in carbon. D.It can break down plastics.

3.What does the underlined part “having its moment in the spotlight”in Paragraph 4 probably mean?

A.Breaking silence. B.Taking a bad turn.

C.Drawing people’s attention. D.Making room for other products.

4.What does Frochlich say about the idea of growing seaweed forests in the last paragraph?

A.It has a long way to go. B.It has been put into practice.

C.It needs lots of money to carry out. D.It needs enough evidence to support.

高二英语阅读理解中等难度题查看答案及解析

It is reported that large amounts of locusts(蝗虫) _____ in their activity in the north now.

A. is                B. are             C. was            D. were

高二英语单项填空中等难度题查看答案及解析

The prices have been rising all the time, especially that of housing. So it is high time the government _______ action to solve it.

A. takes            B. have taken

C. took             D. to take

高二英语单项填空中等难度题查看答案及解析

The prices have been rising all the time, especially that of housing. So it is high time the government _______ action to solve it.

A. takes                      B. have taken          C. took               D. to take

高二英语单项填空简单题查看答案及解析

The planet is getting greener, and we are responsible. Carbon dioxide generated by human activities is promoting photosynthesis (光合作用) and causing a beneficial greening of the Earth’s surface.

For the first time, researchers claim to have shown that the increase in plant cover is due to this “CO2 fertilisation (肥沃化) effect” rather than other causes. However, it remains unclear whether the effect can reduce any negative effects of global warming, such as the spread of deserts.

To home in on the effect of CO2, Randall Donohue of Australia’s national research institute, the CSIRO in Canberra, monitored vegetation (植被) at the edges of deserts in Australia, southern Africa, the US Southwest, North Africa, the Middle East and central Asia. These are regions where there is plenty of warmth and sunlight, but only just enough rainfall for vegetation to grow, so any change in plant cover must be the result of a change in rainfall patterns or CO2 levels, or both.

If CO2 levels were constant, then the amount of vegetation per unit of rainfall ought to be constant, too. However, the team found that this figure rose by 11 per cent in these areas between 1982 and 2010, mirroring the rise in CO2 emissions (排放). Donohue says this lends strong support to the idea that CO2 fertilization drove the greening.

The extra plant growth could have knock-on effects on climate, Donohue says, by increasing rainfall, affecting river flows and changing the likelihood of wildfires. It will also absorb more CO2 from the air, potentially damping down (抑制) global warming but also limiting the CO2 fertilization effect itself.

Donohue cannot yet say to what extent CO2 fertilisation will affect vegetation in the coming decades. But if it proves to be significant, the future may be much greener.

1.According to the author, the increase in plant cover _____.

A. will speed up global warming

B. results from human activities

C. will stop the spread of deserts

D. promotes the CO2 fertilization effect

2.What does the underlined phrase “To home in on” in Para 3 probably mean?

A. To hold back.　　　　　 B. To cut down.

C. To improve.　　　　　 D. To observe.

3. The amount of vegetation in those monitored areas rose with _____.

A. the rise in CO2 emissions　 B. annual rainfall

C. the temperatures around　　 D. the amount of sunlight

4.What’s the best title of the text?

A. More rainfall, less CO2 emission

B. How to deal with carbon emissions

C. Positive effects of global warming

D. CO2 emission making Earth greener

高二英语阅读理解中等难度题查看答案及解析

All the scientific evidence ______ that increasing use of carbon dioxide ______ the rise of the earth’s temperature.

A．show; result in                         B．shows; result from

C．shows; results in                        D．shows; results from

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