Up to now, Marin _____in the library for about two hours.
A. read B. had read
C. has been reading D. would read
高三英语单项填空困难题
Up to now, Marin _____in the library for about two hours.
A. read B. had read
C. has been reading D. would read
高三英语单项填空困难题查看答案及解析
—It’ll take me about two hours to do the work!
—Oh, ! I could do it in half an hour.
A.come on B.no way
C.no problem D.don’t mention it
高三英语单项填空中等难度题查看答案及解析
For every cup of coffee you made, about two spoons of grounds end up in the waste. That doesn’t seem like a lot, but just think about the millions of coffees consumed around the world every single day, and you’ll see the problem. Sure, some of those coffee grounds are recycled as fertilizer to enrich the soil or beauty products like face masks, but most will be buried into the ground. It was while considering this issue that German product designer Julian Lechner came up with a new way of recycling coffee grounds — turning them into tableware.
“We were always drinking coffee at university,” Lechner remembers. “And that’s how I started to wonder. What happens to all that coffee? It was all just getting thrown away.” He began consulting with his professors about ways of using coffee grounds to create a solid material.
“We tried combining with a lot of different things,” Lechner said, “We even tried sugar. That was close, but basically it was a candy cup. It just kept melting after being used three times.” The whole point was to make it last long, so Lechner and his partners went back to the institute to continue their research. Finally, after many failed experiments, they came up with a mix of coffee grounds and a biopolymer(生物高聚物) that seemed to behave the way Lechner had expected it.
“The moment of knowing the cup would actually stand was super-exciting,” he recalls. “It was wonderful to drink that first coffee out of the cup. It proved to be totally worth the wait.” And his creation has proven commercially successful, which is just the icing on the cake. The coffee cups are now present in ten shops across Europe, and the company can hardly keep up with demand, regularly selling out of its stock online.
Lechner will soon launch a larger line of coffee grounds cups and also work on a travel mug. But those are just short-term plans, as Lechner hopes to one day use recycled coffee grounds to create all sort of useful stuff—like sheets and furniture in cafés and restaurants.
1.What do people do with coffee grounds before Lechner?
A. Make products beautiful.
B. Improve the soil.
C. Produce drinking cups.
D. Create solid materials.
2.What can we infer from Paragraph 3?
A. Candy cups can last longer than coffee cups.
B. Coffee grounds are rich in biopolymer.
C. Biopolymer can get coffee cups used repeatedly.
D. Lechner invented coffee cups alone.
3.What does the underlined phrase refer to in Paragraph 4?
A. Profits from coffee cup business.
B. Creation of coffee cups.
C. Decreasing demands for coffee grounds.
D. Consumption of delicious iced coffee.
4.What is the main idea of the passage?
A. A new way of recycling coffee cups.
B. Commercial success from consuming coffee.
C. Recycling coffee grounds into stuff like coffee cups.
D. Different product designers of recycling coffee grounds.
高三英语阅读理解中等难度题查看答案及解析
The driver began to speed up to ______ for the hour he’d lost in the traffic jams.
A. keep up B. make up C. take up D. catch up
高三英语单项填空中等难度题查看答案及解析
The driver started to speed up to ______ for the hour he had lost in the traffic jam.
A. keep up B. take up C. make up D. catch up
高三英语单项填空中等难度题查看答案及解析
The driver started to speed up to ______ for the hour he had lost in the traffic jam.
A. keep up B. take up
C. make up D. catch up
高三英语单项填空中等难度题查看答案及解析
What we should be thinking about now is how to make up for the lost time, not who is _______.
A. blaming B. blamed
C. to be blamed D. to blame
高三英语单项填空困难题查看答案及解析
Mary, stop to have a rest. You _________ the flowers in your garden for nearly two hours.
A．are watering B．were watering
C．water D．have been watering
高三英语单项填空中等难度题查看答案及解析
When Omar Yaghi was growing up in Jordan, his neighborhood received water for only about 5 hours once every 2 weeks. If Yaghi wasn’t up at dawn to turn on the taps to store water, his family, their cow, and their garden had to go without. At a meeting last week, Yaghi, now a chemist at the University of California, reported that he and his colleagues have created a solar-powered device that could provide water for millions in water-stressed regions. At its heart is a porous crystalline (多孔晶体) material, known as a metal-organic framework (MOF), which acts like a sponge: It sucks water vapor out of air, and then releases it as liquid water.
Yaghi and his colleagues first developed a zirconium( 锆 )-based MOF in 2014 that could harvest and release water. But at $160 per kilogram, zirconium is too expensive for massive use. So, last year, his team came up with an alternative called MOF-303, based on aluminum, which costs just $3 per kilogram, but the harvest was only about 0.2 liters per kilogram of MOF per day.
In July 2019, Yaghi reported that his team has designed a new and far more productive water harvester. Supported by a solar panel to power a fan and heater, which speed the cycles, the new device produces up to 1.3 liters of water per kilogram of MOF per day from desert air. Yaghi expects further improvements to increase that number to 8 to 10 liters per day. And his company plans to release a microwave-size device able to provide up to 8 liters per day this fall. The company promises an enlarged version next year that will produce 22,500 liters per day, enough to supply a small village.
However, it needs to be shown that Yaghi’s MOFs can be produced cheaply on a large scale. Each potential commercial MOF needs to prove itself in stability, efficiency, and life span. But if MOFs can pass those tests, they could offer a solution to some of the world’s most pressing problems.
1.Why is Omar Yaghi’s childhood mentioned at the beginning?
A.To show how serious water problem is. B.To lead in the topic.
C.To introduce the chemist. D.To arouse reader’s interest.
2.What is the problem of MOF-303?
A.It costs too much. B.It can’t last long.
C.It is hard to operate. D.It is low in efficiency.
3.According to Yaghi, how much water will a large water harvester produce per day?
A.1.3 liters. B.10 liters.
C.22,500 liters. D.8 liters.
4.What can be concluded from the last paragraph?
A.Yaghi’s MOFs are in great demand now.
B.Yaghi’s MOFs may help solve water shortage.
C.Yaghi’s MOFs have already entered the market.
D.Mass production of Yaghi’s MOFs is impossible.
高三英语阅读理解中等难度题查看答案及解析
When Marx was in London, he __read at the library for hours.
A．would B．might C．could D．should
高三英语单项填空简单题查看答案及解析