In extreme weather, a worn tyre can break easily ______ it’s mended, as is often the case.
A.when B.where C.which D.that
高三英语单项填空中等难度题
In extreme weather, a worn tyre can break easily ______ it’s mended, as is often the case.
A.when B.where C.which D.that
高三英语单项填空中等难度题查看答案及解析
The stomach is an extremely strong organ, full of acid to break down each meal. In order to prevent this acid from burning a hole in our stomachs and damaging other organs, our stomach lining is specially adapted to contain the acid safely.
H. pylori are able to live in the stomach by living in the lining, safe from harsh stomach acid. These bacteria are actually pretty common in people, approximately a third of Australians have H. pylori in their bodies, but not all have symptoms.
The bacteria can eventually create infection in stomach lining, a condition known as gastritis (胃炎), by wearing away the lining and allowing stomach acid to burn away stomach tissue, causing painful ulcers (溃疡)。
Up until the 1980s, it was thought that bacteria could not survive in stomach acid. The cause of stomach ulcers was due to lifestyle choices: stress, smoking, spicy foods; the stomach acid was breaking through the lining on its own.
This belief was first questioned in 1979 by Robin Warren, an Australian pathologist, who found bacteria on a microscope slide containing the stomach lining of a patient with gastritis. In the years that followed Warren continued his research.
Warren then teamed up with Barry Marshall in 1981 and the two continued with the research, trying to separate the mystery bacteria and find a cure. Over the next three years, they tested their theories with some positive results, however the idea that bacteria could be the cause of gastritis was not widely accepted or even acknowledged.
Finally, fed up with being ignored and confident in his findings, Barry Marshall decided to test on himself. He infected himself with H. pylori and soon developed gastritis and terrible stomach ulcers. Marshall then began to cure himself by taking a dose of antibiotics (抗生素). This once and for all proved not only that bacteria could grow in stomach acid, but it could also cause gastritis and stomach ulcers.
Eventually, the world fully acknowledged Warren and Marshall's huge contribution to science and medicine and the two were awarded the Nobel prize in Medicine in 2005. Twenty-six years after Robin Warren first began his research.
1.Why did the academics initially refuse to accept that H. pylori caused gastritis?
A.Lifestyle choices caused stomach ulcers.
B.Stomach acid could break through the lining on its own.
C.They thought that bacteria couldn't survive in the stomach.
D.The Australian pathologist Robin Warren provided no evidence.
2.How did Barry Marshall prove that H. pylori caused gastritis?
A.Choosing unhealthy lifestyles. B.Introducing H. pylori to his own stomach.
C.Finding the bacteria on stomach lining. D.Growing H. pylori in the lab.
3.What can we infer from the text?
A.Scientific progress takes time. B.Science guides medical practices.
C.Warren is not a productive scientist. D.Only Marshall deserves the prize.
4.The text is most likely written to .
A.Chemists B.Patients C.Researchers D.The general public
高三英语阅读理解中等难度题查看答案及解析
Many electronic parts are made of hard materials that break easily. That makes them tough to use in products that need to bend. Now, Sam Yoon and his team have developed a thin mesh (网状物) that can both bend and conduct electricity.
His team started out with something called acrylonitrile, a clear liquid often used to make thin plastic fibers. Yoon and his team mixed this material with another liquid, which acted as a solvent. A solvent is something that can make other substances into liquids. Then, they squeezed the mix through a very tiny pipe: As the mixture was sprayed through the air, the solvent evaporated(挥发)and the acrylonitrile molecules linked up to make long chains, creating a type of plastic known as PAN. The researchers continually squeezed the mixture through the pipe. A single long PAN fiber was created. The scientists moved the pipe back and forth as the PAN was squeezed out. It ended up creating a layer that looked something like a spider’s web.
PAN, like most plastics, doesn’t conduct electricity. So the team’s next step would normally be to add a coating of metal so that electricity could flow through it. But it could be tough sticking such coatings on PAN. So the researchers added an extra step. They sprayed a thin coating of an inert metal onto the PAN. Inert metals, like gold, typically don’t react with other materials. The researchers then added another layer of PAN fiber at the top of the first, web-like layer. They provide temporary support, helping the metal-sprayed base resist sinking during the next step.
The researchers connected the fiber-covered frame to a negatively changed electrode. Then they dipped the fiber-covered frame into a solution that included the liquid copper. The team turned on the electric current for about one minute to make it run through the solution. The copper in the solution was attached to all of the fibers. But it stuck only to those that wore a metal jacket. Besides adding a thin layer of copper that conducts electricity, this process helped bond the PAN strands together at places, where they touched each other, Yoon notes.
The researchers then attached all of the fibers to a thin, clear layer of plastic, which had sticky backing, like a Band-Aid. Finally, the team dipped all of these into a liquid that made any of the PAN fibers that lacked a copper jacket into liquids. Only those that can be used to conduct electricity were left. Because the fibers were very thin and widely separated, light waves easily travel through the mesh. The copper coating acted just like a wire, permitting electricity to flow freely across it.
1.The team used another liquid in the process to .
A.make acrylonitrile evaporate B.turn acrylonitrile into plastic fibers
C.make acrylonitrile conduct electricity D.conduct electricity instead of acrylonitrile
2.What should the team do first when using PAN?
A.Make it easy to break. B.Make it react with other materials.
C.Make it conduct electricity. D.Find a way to make it into a liquid.
3.What does the underlined word those in the last paragraph refer to?
A.The thin plastics. B.Just the copper coatings.
C.All the PAN fibers. D.All the copper-coated fibers.
高三英语阅读理解困难题查看答案及解析
_________ the extremely hot weather, we continued having classes.
A.Thanks to B.In addition to C.In defence of D.Regardless of
高三英语单项填空简单题查看答案及解析
_________ the extremely hot weather, we continued having classes.
A.Thanks to B.In addition to C.In defence of D.Regardless of
高三英语单项填空中等难度题查看答案及解析
__________ the extremely hot weather, we continued having classes.
A. Thanks to B. In addition to
C. In defense of D. Regardless of
高三英语单项填空中等难度题查看答案及解析
I was stuck in O'hare airport on an extremely long weather delay, pacing up and down the waiting hall for some exercise, when I passed a wine bar for the twentieth time or so. But this time there was a young woman behind the piano, playing what I could only describe as absolutely beautiful classical music. She had not been there ten minutes earlier when I passed.
I sat down at an empty table for four very near the piano, and began to be warmed by her music and a bit by the wine! She played so effortlessly and with such beauty in every note. Her music immediately brought a huge smile to my face!
Soon, on a break, I thanked her and she told me that after a long day traveling, and now also facing long weather delays, she "just needed to blow off some steam." Wow! Her version of blowing off steam was a gift to get.
As I sat alone drinking my wine, absorbed in this young woman's celebration of her musical passion, two women approached my table and asked if they could join me. I invited them to sit and we immediately began sharing our love of music and celebrating the happiness the piano music was bringing us at that moment.
The two women and I began to talk about our travels, life journeys, and passions. Hearing that unbelievable piano music, and then meeting such interesting women, who generously shared with me their wisdom, perspectives, and feelings of love for each other, was truly joyous. Faced with an 11-hour travel day — to get what normally takes 45 minutes — could have been physically and emotionally exhausting. Rather, by accident of walking by a wine bar at the right moment, and having a couple of seats open at my table, my life was filled with joy.
I will cherish those moments for some time to come. This experience highlights (突出) the critical need in our lives to stop and listen to the music, to invite others to sit at your life table, to open yourself up to a stranger or two, sharing some of your deepest perspectives and experiences. Be open to noticing, absorbing, and also contributing to the joy around you!
1.What does the underlined phrase “blow off some steam” in Paragraph 3 probably mean?
A. Reduce anger.
B. Relax herself.
C. Make full use of time.
D. Breathe fresh air.
2.How long was the author’s travel supposed to take without weather delay?
A. 10 minutes. B. 20 minutes. C. 45 minutes. D. 11 hours.
3.How did the author feel about the experience in the airport?
A. Happy and meaningful.
B. Lonely but unforgettable.
C. Boring and meaningless.
D. Long and tiring.
4.The author writes the text in order to encourage people _______.
A. to make the acquaintance of strangers
B. to share your experiences with others
C. to communicate with others more often
D. to notice and enjoy the happiness around you
高三英语阅读理解中等难度题查看答案及解析
阅读理解
Umbrella is what we easily forget and leave behind in our daily life. When the weather is fine, we certainly don’t think of it; only when it's raining, we’ll carry it purposefully. But as soon as the rain stops, most likely we’ll forget 1. we’ve put it. It has to wait patiently and pitifully for2. owner to claim it, otherwise it’ll remain alone as a deserted umbrella.
Once I suddenly found my longtime 3. (use) umbrella “disappeared” I really got lost and regretted quite some time 4.my own carelessness.
Several days later, out of my 5. (expect), I saw it quietly stand in a corner of the house where I worked. I was extremely glad to regain it. Looking carefully at it, though it was so familiar 6. me, I found for the first time its wooden handle 7.(wear)out as a result of repeated rain-wash for years. I sought for it only when I needed it. It occurred to me that I should have paid 8.(much) attention to it.
It sets me thinking. Around us there are always people giving us support in silence just like9. umbrella that protects us from the rain or any wretched weather. Will gou think of those individuals 10. have helped you get through difficlty when you are leading a comfortable life?
高三英语语法填空中等难度题查看答案及解析
Umbrella is what we easily forget and leave behind in our daily life. When the weather is fine, we certainly don’t think of it; only when it's raining, we’ll carry it purposefully. But as soon as the rain stops, most likely we’ll forget 1. we’ve put it. It has to wait patiently and pitifully for 2. owner to claim it, otherwise it’ll remain alone as a deserted umbrella.
Once I suddenly found my longtime 3. (use) umbrella “disappeared”. I really got lost and regretted quite some time 4. my own carelessness.
Several days later, out of my 5. (expect), I saw it quietly stand in a corner of the house where I worked. I was extremely glad to regain it. Looking carefully at it, though it was so familiar 6. me, I found for the first time its wooden handle 7. (wear)out as a result of repeated rain-wash for years. I sought for it only when I needed it. It occurred to me that I should have paid 8. (much) attention to it.
It sets me thinking. Around us there are always people giving us support in silence just like
9. umbrella that protects us from the rain or any wretched weather. Will gou think of those individuals 10. have helped you get through difficlty when you are leading a comfortable life?
高三英语阅读理解中等难度题查看答案及解析
Umbrella is what we easily forget and leave behind in our daily life. When the weather is fine, we certainly don’t think of it; only when it's raining, we’ll carry it purposefully. But as soon as the rain stops, most likely we’ll forget 1. we’ve put it. It has to wait patiently and pitifully for2. owner to claim it, otherwise it’ll remain alone as a deserted umbrella.
Once I suddenly found my longtime 3. (use) umbrella “disappeared”. I really got lost and regretted quite some time 4. my own carelessness.
Several days later, out of my 5. (expect), I saw it quietly stand in a corner of the house where I worked. I was extremely glad to regain it. Looking carefully at it, though it was so familiar 6. me, I found for the first time its wooden handle 7. (wear)out as a result of repeated rain-wash for years. I sought for it only when I needed it. It occurred to me that I should have paid 8. (much) attention to it.
It sets me thinking. Around us there are always people giving us support in silence just like 9. umbrella that protects us from the rain or any wretched weather. Will gou think of those individuals 10.have helped you get through difficlty when you are leading a comfortable life?
高三英语语法填空中等难度题查看答案及解析