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题型:阅读理解-阅读单选 难度:0.65 引用次数:48 题号:10519726

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.ChemistsB.PatientsC.ResearchersD.The general public

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【推荐1】Do you love food? Whether you’re a foodie or someone who just likes eating, there is so much to choose from. We know that too much of the wrong kind of food can be bad for our health, but for some people having a food allergy means eating certain things can actually be harmful — and now, it seems, this is affecting more and more of us.

An allergy is caused by the immune system fighting substances in the environment, known as allergens(过敏原), which should be seen as harmless. Food allergies can cause life-threatening reactions, which means people have to spend their lives following strict dietary restrictions and worrying about the ingredients of everything they consume. Allergy specialist Dr Adam Fox says, “If you look back over, say, 30 or 40 years… there are much more allergic problems around now than there were.”

We often hear about people having allergies to dairy products and to peanuts. Last year a young girl died after suffering a deadly allergic reaction from eating a baguette containing sesame seeds. This led to a call for better food-labelling laws.

Research has found that this problem is particularly affecting children. More and more of them are having allergic reactions to certain foodstuffs. Dr Alexandra Santos from King’s College London says “food allergy now affects about 7 percent of children in the UK and 9 percent of those in Australia. Across Europe, 2 percent of adults have food allergies”.

So what might be the cause? Dr Santos says the increase in allergies is not simply the effect of society becoming more aware of them and better at diagnosing them; it seems to be more environmental. She says possible factors are “pollution, dietary changes and less exposure to microbes (微生物), which change how our immune systems respond”.

A lot of work is being done to try and find a cure, but that’s not easy. So for now allergy sufferers must watch what they eat and they must rely on clear and accurate labelling.

1. What does the underlined word “this” in paragraph 1 refer to?
A.Having an imbalanced diet.
B.Being allergic to some certain food.
C.Consuming too much of harmful food.
D.Fighting substances in the environment.
2. Which of the following writing skills is NOT used in paragraph 2 & 3?
A.Giving a definition.B.Making a comparison.
C.Offering an example.D.Presenting specific data.
3. What can we infer from the text?
A.Dairy products are to blame for most food allergies.
B.Kids don’t suffer from food allergies as much as adults.
C.Allergies unknown in the past may be diagnosed now.
D.More exposure to microbes can reduce food allergies.
4. What’s a practical suggestion for allergy sufferers?
A.Never try new food.B.Make efforts to find a cure.
C.Have a balanced diet.D.Read labels before eating.
2020-10-11更新 | 205次组卷
阅读理解-阅读单选(约360词) | 适中 (0.65)
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【推荐2】Early data from Israel suggests Covid-19 infection rates began to decrease among a group of vaccine (疫苗) recipients two weeks after they received the first shot of Pfizer Inc. and BioNTech SE's vaccine, offering important insights to other countries as they roll out their own campaigns.

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Israel's largest health-care provider, Clalit Health Services, compared test positivity rates among 200,000 people over 60 who received the vaccine with 200,000 that didn't. Until day 14, there was little difference between the two groups. But after that, the data showed a 33% fall in infection rates among those who had already been vaccinated compared with those who hadn't. Clalit noted that the number of people infected was statistically significant, but said it wouldn't release final numbers until its study is published.

Pfizer says people must receive both doses of the vaccine for it to be fully effective. In Pfizer's trials, the vaccine was shown to take about 12 days before it started to protect people. The Clalit study suggests that the first dose could reduce infections among those vaccinated as early as two weeks after injection.

Israel, like many other countries, has given priority to those over 60 in the first stage of its vaccination drive,making the group the best fit for study. Nearly three out of four people in this age group have received the first dose of the vaccine since Israel's campaign began on Dec.20.

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1. What does the underlined part "hit that mark" refer to?
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D.Israel publishes its data as instructed
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A.The Pfizer Vaccine Proves Safe
B.Old People Get Vaccinated in Israel
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D.Israel Succeeds in Fighting Covid-19
2021-02-02更新 | 135次组卷
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【推荐3】An inability to stand on one leg for 10 seconds in later life is linked to nearly double the risk of death from any cause within the next decade, according to a new study. The simple balance test may be useful to be included in routine physical exams for people in middle and old age, the research, which was published in British Journal of Sports Medicine, suggested.

While aging leads to a decline in physical fitness, muscle strength and flexibility, balance tends to be reasonably well-preserved until a person’s 50s, when it starts to decline relatively rapidly, the research noted. Previous research has linked the inability to stand on one leg to a greater risk of falls and to cognitive decline.

The study involved 1,702 people aged 51 to 75 living in Brazil, who were asked to balance unsupported on one leg during an initial check. Researchers told the participants to place the front of the free foot behind the standing leg, keep their arms by their sides and eyes. Fixed straight ahead. Up to three attempts on either foot were permitted.

The study participants had an average age of 61 and two-thirds of them were men. Around 1 in 5 failed to balance on one leg for 10 seconds at the initial checkup. Researchers monitored the participants after the initial checkup for a period of seven years, during which 7% of the people died. The proportion (比例)of deaths among those who failed the test (17.5%) was significantly higher than deaths among those who were able to balance for 10 seconds(4.5%).

The research was observational and didn’t reveal cause and effect. The study didn’t look at any possible biological mechanisms that might explain the link between poor balance and longevity.

The study noted that, overall, those who failed the test were in poorer health, with greater proportion of suffering from obesity, heart disease and high blood pressure. Diabetes was also more common among those who failed to complete the test.

1. What did the participants take during the research?
A.Vision examinations.B.Medical examinations.
C.Flexibility tests.D.Balance tests.
2. How did the researchers get the findings?
A.By calculating the participant numbers.
B.By comparing the participants’ lifetime.
C.By identifying the participants’ diseases.
D.By monitoring the participants’ pressure.
3. What was the research’s shortcoming?
A.It had few participants.
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C.It lacked in-depth study.
D.It was the first research on balance.
4. What may be the best title for the text?
A.Balance determines a person’s lifetime
B.The balance test should be promoted to people
C.The ability to stand on one leg can reflect health levels
D.Being able to stand for 10 seconds means being healthy
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