If you're one of the millions of Americans no...

If you're one of the millions of Americans now trapped in home because of the COVID-19，it might feel like you're cooking more than you've ever cooked in your entire life. And maybe you' re planning to reduce your home food wastes. A good way of dealing with them is to learn to make compost (堆肥).

Select your food wastes. Start with fruits and vegetables — the skin of a sweet potato，the top of your strawberry. Also tea bags, coffee grounds, old flowers and even eggshells are good raw materials. Store these food wastes in a container so you can add them bit by bit. The container doesn't have to be bought online. It can just be an old milk carton (纸箱) or an old wooden chest —just work with what you have available. Also, you can store the food wastes in a bag in your freezer or fridge. That's an easy way to avoid odors and insects in your kitchen.

The crucial step is to make the compost mix. In the world of composting you're inevitably going to hear about ''the greens and browns''—the two main elements for your mix. ''Greens'' are typically wet food wastes, like fruit and vegetable peelings. They are a crucial part for the growth of organisms (微生物),''Browns" are typically dry and they are more carbon rich like newspapers, dried leaves，and pine needles. A good thing to remember is when you're layering， put the dry browns on the bottom with the wet greens on the top because they allow water and air to flow. That will make sure organisms can do their job.

How long do you have to wait for the compost breakdown? If it's hot, you could get there in two months pretty easy. If it's cold, you could be there in six months, And for every component to break down, it might be a year.

In the end ''your nose knows'' when the compost is ready. It just smells so woody, earthy, sweet or sometimes sour. The smell can tell how well you work at your compost.

1.What is a good solution to your home food wastes?

A.Make a plan and reduce the wastes.

B.Collect the picked wastes to make compost.

C.Select the wastes and bury them into the earth.

D.Pick the wastes and put them in a bag in your fridge.

2.What plays a crucial role in making the compost mix?

A.Wet ''greens''

B.Dry "browns''

C.Carbon rich materials.

D.Wet ''greens'' and dry ''browns''.

3.Why should the ''browns'' be put on the bottom with the ''greens'' on the top?

A.To help the organism work on the compost efficiently.

B.To save more space for the water and air to flow.

C.To allow the water and air to flow into the container.

D.To make sure the organism can live longer and better.

4.What does the author feel about making compost?

A.Pretty easy and fun.

B.Complex and time killing.

C.Demanding patience but worthwhile.

D.Calling for hard work but enjoyable.

高三英语阅读理解中等难度题查看答案及解析

If you're one of the millions of those who use escalators each year, you are probably deeply familiar with the vertical grooves（竖凹槽）that cover each stair. Few of us have stopped to consider why they exist, though. In fact, it's one of the everyday things we take for granted.

But it is a little complicating when you think about it. Sure, the deep, grey lines make an escalator's metal stairs more appealing to the eye. But regular stairs don't have grooves like these; why do escalators need them? Is it because of the movement?

It turns out those grooves serve a more functional purpose. And, yes, it does have to do with the movement, as well as with general cleanliness! Anyone who has ridden an escalator knows that the steps everlastingly circulate from the top to the bottom. You've surely noticed the ridged yellow lip at the top of the escalator. But here's what you may not have noticed: As an escalator's steps flatten, this ridge—also called the comb plate—sweeps away any trash or litter that might have fallen on the stairs. Those grooves lock the step and comb plate together, which makes it harder for any dangerous materials to slide underneath the lip. This prevents foreign objects from getting stuck in that gap, potentially causing the escalator to stop, or worse, break down completely.

That's not the only reason why the grooves were created, though. They are also a good place for water to pool together, protecting you from a bad fall on the slick surface.

So the next time you step on an escalator, take a moment to appreciate those metal grooves. They exist to make sure you get to your office meeting on time.

1.What are the first two paragraphs trying to say?

A.Millions of people use escalators every year.

B.Few people think much about the grooves.

C.Escalators are complicated machines.

D.Grooves make the stairs look better.

2.The ridge is mainly designed to____

A.clean off dangerous objects.

B. keep the stairs in movement.

C.flatten the steps.

D.lock the steps.

3.What does the underlined word "slick” mean in Paragraph 4?

A.Smooth. B.Sticky.

C.Steep. D.Slippery.

4.What's the passage mainly about?

A.The importance of escalators.

B.The reasons for grooves on stairs.

C.The look of grooves in escalators.

D.The safe ways of riding escalators.

高三英语阅读理解困难题查看答案及解析

If you're not one of the record 1. 9 million British holiday makers who went on a cruise (海上航游) last year, isn't it high time you walked up the gangway?

We've rounded up all of the best packages you need to know about, as well as picking out some of our top favourite late deals.

US Transatlantic From £629 per-person: Sail 13 nights with stops including Boston, New York. Price is on a full-board basis and includes accommodation as well as on board entertainment and activities. Based on an interior cabin(船舱) but upgrade to Ocean View for an extra £ 177per-person.

Cuba from £400 per-person: Sail five nights on board Majesty of the Seas with stops in Havana» Cuba and Mexico. Price is on a full-board basis and includes accommodation as well as onboard entertainment and activities.

Portugal, Spain and Italy from £479 per-person：Sail seven nights with stops including Madeira, and Malaga on a full-board basis. Price includes meals, afternoon tea, late-night snacks, luxury en-suite accommodation, all onboard activities and entertainment.

European cities from £579 per-person: Sail on board MSC Meraviglia from Barcelona to visit Marseille, Genoa, Civitavecchia, Palermo and Valetta, and make the most of MSC's all-inclusive drinks package including coffees, cocktails, wine, beer, spirits and soft drinks for over 18s. Price is on a cruise only basis with two people sharing a cabin.

While there are plenty of great late deals available to customers, the cruise industry often has some of its best deals months in advance. Going forward, cruise lines are looking to change the way the booking system works so the prices go up closer to the departure.

1.Who is the passage written for?

A.sailor. B.A holiday designer.

C.An advertiser. D.A potential tourist.

2.How much should a couple pay for US Transatlantic Ocean View cabin?

A.£1612. B.£1258.

C.£806. D.£629.

3.Whose price doesn't include entertainment?

A.Cuba. B.Portugal, Spain and Italy.

C.European cities. D.US Transatlantic.

高三英语阅读理解中等难度题查看答案及解析

The English-language version of Wikipedia has almost six million articles. And if you’re a cheating student, that’s six million essays already written for you. But plagiarism isn’t really an effective way—just type the text into a search engine and the game is over. Then what about having a ghostwriter compose your final essay?

“Standard plagiarism software cannot detect this kind of cheating.” said Stephan Lorenzen, a data analyst at the University of Copenhagen. In Denmark, where he’s based, ghostwriting is a growing problem at high schools. So Lorenzen and his colleagues created a program called Ghostwriter that can detect the cheats.

At its central part is a neural network trained and tested on 130,000 real essays from 10,000 Danish students. After reading through tens of thousands of essays labeled as being written by the same author or not, the machine taught itself to possess the characteristics that might spot cheating. For example, did a student’s essays share the same styles of punctuation? The same spelling mistakes?

By examining inconsistencies like those, Ghostwriter was able to seek out a cheated essay nearly 90 percent of the time. The team presented the results at the European Meeting on Artificial Neural Networks, Computational Intelligence and Machine Learning. There’s one more aspect here that could help students. Your high school essays probably get better over time as you learn to write and the machine can detect that. The final idea is to detect students who are at risk because their development in writing style isn’t as you would expect. Teachers could thus give extra help to kids who really need it, while sniffing out the cheaters too.

1.When a student wants to cheat in writing an essay, ________.

A.his cheating may be detected in a certain way

B.essays offered by Wikipedia can’t be downloaded

C.he won’t hire a ghostwriter to write one for himself

D.ghostwriting can be detected by standard plagiarism software

2.Which aspect of the program “Ghostwriter” is talked about in Paragraph 3?

A.Its components. B.Its weaknesses.

C.Its influences. D.Its working theory.

3.Which one of the following is the function of “Ghostwriter”?

A.It never fails to find out a cheated essay. B.It can detect a student’s progress in writing.

C.It can help a student to correct his pronunciation. D.It can give extra help instead of teachers.

4.Where is the text most likely from?

A.A guidebook. B.A magazine.

C.A novel. D.A diary.

高三英语阅读理解中等难度题查看答案及解析

More than 26 million Americans took part in the Vietnam (越南)War. More than 58,000 of them 21; over 300,000 were 22, and nearly 2300 were missing and thought dead. Improved 23services saved many soldiers with serious 24 that in earlier wars would have been fatal(致命的). More than 600 Americans were prisoners of war (POWs).Some POWs spent six years or even 25 in North Vietnamese prisons.

One of the 26things of the war has been the fate of its veterans(退伍军人).The  27  of soldiers from the Vietnam War was not   28celebrated. Americans 29them with stony silence.

The public's 30 reaction made many veterans angry and 31 them. They had 32a life-and-death struggle, obeying orders for their country's national 33 .In the book Born on the Fourth of July (1976).Vietnam veteran Ron Kovic expressed his 34over their not being supported.

"I didn’t want to  35 it at first---people went against us when we were putting our 36 on the frontline for our country……How could they do this to us? Many of us wouldn't be coming back……"

Thousands of Vietnam veterans turned to drugs or37to kick the drug habits they had developed  38 the war. Many others had trouble in finding jobs or 39down and starting families. Between 250,000 and 350,000 homeless Americans--nearly one third of the total 40   Vietnam veterans.

高三英语完型填空困难题查看答案及解析

As millions of Americans crowd into the gym armed with New Year’s resolutions to get in shape, medical experts are offering an additional reason for exercise: Regular workouts may help fight off colds and flu, reduce the risk of certain cancers and chronic diseases and slow the process of aging.

Physical activities have long been known to help maintain a healthy weight and reduce stress. Now, a growing body of research is showing that regular exercise—as simple as a brisk 30-to-45-minute walk five times a week—can boost the body’s immune system, increasing the circulation of natural killer cells that fight off viruses and bacteria. And exercise has been shown to improve the body’s response to the influenza vaccine (疫苗), making it more effective at keeping the virus at bay.

Medical experts warn inactivity poses as great a health risk as smoking, resulting in heart disease, cancer, depression, and diabetes. The Centers for Disease Control and Prevention says quite a few U.S. adults do not engage in any leisure-time physical activity.

Even slim people who are inactive are at high risk of death and disease. So while reducing obesity is an important goal, “the better message would be to get everyone to walk 30 minutes a day” says Robert Sallis, co-director of sports medicine at Fontana Medical Center. “We find it necessary to refocus the national message on physical activity, which can have a bigger effect on health than losing weight.”

Regular exercise has been shown to prevent the ongoing damage done to cells, tissues and organs that underlies many chronic conditions. Building on that earlier research, scientific studies are now suggesting that exercise-induced changes in the body’s immune system may protect against some forms of cancer.

Researchers are also investigating whether exercise can influence aging in the body. In particular, they are looking at whether exercise lengthens telomeres, the strands of DNA at the tips of chromosomes. When telomeres get too short, cells can no longer divide and they become inactive, a process associated with aging, cancer and a higher risk of death.

A study, published in Circulation, the medical journal of the American Heart Association, concluded that physical activity has an anti-aging effect at the cellular level, suggesting exercise could prevent aging of the cardiovascular(心脑血管) system.

The guidelines, developed by the Department of Health and Human Services, recommend that adults get at least two hours and 30 minutes weekly of moderate-intensity aerobic(有氧的) physical activity, or one hour and 15 minutes a week of vigorous-intensity aerobic exercise, or an equivalent combination of both. The guidelines also say that additional health benefits can be obtained from as much as doubling the minimum recommendation for aerobic exercise.

1.What is the main purpose of many Americans who take exercise?

A. To have a good figure.　　 B. To make them strong-minded.

C. To cure some common diseases.　　 D. To prevent themselves getting old.

2.It can be inferred from the passage that __________.

A. natural killer cells strengthen the body’s immune system

B. regular exercise can remove the viruses and bacteria

C. obesity has become a social problem in America

D. American people need to attach more importance to physical exercise

3.How can physical activity stop aging?

A. By preventing cell division.　　 B. By getting rid of aging cells.

C. By making telomeres longer.　　 D. By repairing the damaged organs.

4.What might be the best title for the passage?

A. New Studies about Physical Exercise　　 B. The Hidden Benefits of Exercise

C. How to Free Ourselves from Diseases?　　 D. Lose Weight or Keep Healthy?

高三英语阅读理解困难题查看答案及解析

No one knows for certain how the first Americans arrived in _____ is now the United States.

A. which　　 　　　　　　 　 B. what

C. where　　 　　　　　　 　 D. why

高三英语单项填空中等难度题查看答案及解析

No one knows for certain how the first Americans arrived in _____ is now the United States.

A. which　　　 　　　　　　 B. what

C. where　　 　　　　　　 　 D. why

高三英语单项填空中等难度题查看答案及解析

No one knows for certain how the first Americans arrived in _____ is now the United States.

A. which　　　　 B. what　　　　 C. where　　　　 D. why

高三英语单项填空中等难度题查看答案及解析

No one knows for certain how the first Americans arrived in _____ is now the United States.

A. which　　 　　　　　　 　 B. what

C. where　　　　 　　　　　　 D. why

高三英语单项填空中等难度题查看答案及解析