题目
题型:不详难度:来源:
Remove stones from the soil while preparing the ground,and test it before adding fertilizer Beet seeds can be planted as soon as the soil can be worked at the start of the growing season. Planting them every two or three weeks will provide a continuous harvest into the fall. A beet seed is a fruit containing several seeds. Overcrowding the plants will mean that the roots cannot spread out and grow,so thin the beets by removing the smaller ones and using them as greens.
A specialist named Cindy Haynes says little or no fertilizer is needed in rich soils. Once the seeds are planted,however,she suggests covering the soil to protect it from the rain and during dry periods. She also suggests putting a fence around the plants to keep away rabbits and deer. She says the only work beets need once they have been thinned is weeding and, when the weather is dry,a weekly watering. For best results,beets should be picked when the roots are two and one-half centimeters around. Larger beets can be tough,and have to be cooked for a long time. Beets can be eaten in many ways.
60.What is the second paragraph mainly about?
A. How to test the soil. B. How to plant beets
C. When to harvest beets. D. When to plant beets.
61.Smaller beets are often removed in order to .
A. give other beets space to grow B. add more fertilizer to the soil
C. plant new seeds D. use the green,young leaves in salads
62.What may the next part of the last paragraph be about?
A. When to pick beets. B. How to eat beets.
C. The uses of beets. D. The taste of larger beets.
63.The passage is most probably from a(n) .
A. gardening book B. education magazine C. science report D. entertainment magazine
答案
解析
核心考点
试题【The beet (甜菜) is a tasty root vegetable that does not require much work to grow.】;主要考察你对题材分类等知识点的理解。[详细]
举一反三
But a recent study suggests that some children may be able to beat back their allergic reactions to peanuts by gradually introducing trace amounts of the nut into their diets. It"s too early to say for certain,so if you have a peanut allergy,do not try this at home. But the first results look promising.
Two teams of scientists have been experimenting on a group“of 29 children who are allergic to peanuts”At the beginning of the study,each kid received less than 1/1,000 of a peanut per day. (Imagine splitting a peanut into 1,000 parts!) Over the course of the study, the children gradually increased the amount of the peanut in their diets
Nine of the children have been receiving the treatment for two years,and five of those nine now appear to be free of their peanut allergies,and can eat peanuts with no problem. But the other four have not benefited so much from the therapy(治疗).
The two teams of scientists are now doing a follow-up study on two groups of children with the allergy. Children in one group will receive the new therapy,while the others will not. Researchers hope this study will help them learn if the therapy truly does work.
Scientists don"t understand why some people get peanut allergies and others don"t,but are trying to find a way to help people with the allergy. Because of the severity of some peanut allergies,scientists want to know the answer as soon as possible. “This is very encouraging, but remember,it"s not something you try at home,”says one of the researchers.
68.According to the passage,the peanut allergy .
A. can be deadly if only a small amount is used
B. causes a lot of trouble for many parents
C. allows people to eat only small amounts of peanuts
D. is considered the least common and dangerous food allergy
69.Scientists are trying to treat peanut allergies by .
A. exposing children with the allergy to as many peanuts as possible
B. changing the eating habits of children with peanut allergies gradually
C. giving children Peanuts in slowly increasing amounts
D. exploring ways to resist the feelings caused by peanut allergies
70.The experiment shows that .
A. people with peanut allergies can"t use small amounts of peanuts in their diets.
B. children are more easily cured than adults
C. all children can be cured of their peanut allergies if given more time of treatment
D. about 55-percent children with peanut allergies have been cured
71. Scientists are now doing a follow-up study in order to .
A. explore why some people get the illness while others don’t
B. show whether peanut allergies can really be dangerous
C. check whether the therapy really works or not
D. explore whether the allergy can be cured without treatment
Researchers have now come up with some new ideas. Their work may give people the ability to re-grow lost limbs. The researchers started with two simple experiments:when you cut a newt’s leg at the ankle, only the foot grows back;when you cut off a leg at the very end, the whole leg grows back. In both cases, the re-growth begins with stem cells. Stem cells can develop into nearly any type of cell in the body.
How do a newt’s stem cells know when to grow only a foot and when to re-grow a whole leg?
This question relates to another mystery. In newt’s, a cut-off leg will grow back only if the nerve bundle(神经束)in it also grows back , but if something prevents the nerve bundle from growing, the stem cells at the wound won’t re-grow a new leg.
In its study, a British team focused on a protein called n-AG. When the team prevented nerves in a limb from growing, but added the n-AG protein to stem cells in the limb, the limb still re-grew. That protein seems to guide limb re-growth. People have proteins that are similar to n-AG. Further research into these materials may someday help human limbs recover by themselves.
40. In the experiments, the researchers cut off a newt’s foot or leg to find out _____.
A. what stem cells were B. whether they would grow back
C. how long it would take to re-grow D. how they would re-grow
41. A newt will re-grow its leg if _____.
A. its ankle was cut off but the nerve bundle was good
B. its leg was cut off and the nerve bundle stopped growing
C. its leg was cut off and the nerve bundle could grow back
D. its ankle and the nerve bundle were cut off
42. What do the underlined words “these materials” refer to?
A. Nerve bundles and proteins. B. Proteins similar to n-AG.
C. Stem cells and proteins. D. Stem cells and nerve bundles.
43. The first sentence of the passage _____.
A. acts as a lead–in B. shows where researchers got their new ideas
C. states the author’s opinion D. describes the result of researchers’ studies
B
Do you have a sore throat, a running nose and a headache? Do you keep coughing and sneezing? If you do, the chances are that you have a cold or perhaps flu — but which one? Although both colds and flu are caused by viruses, they are very different illnesses.
Colds, which usually last about a week, affect the nose most. They commonly cause a running nose and sneezing. Sometimes, they cause a headache, a cough and slightly aching muscles.
Flu is a much more serious illness and is caused by different group of viruses. People with flu usually get all the symptoms described above. However, they also get a high fever, a dry cough and much worse aching. Fever is one of the characteristic symptoms of the flu for all ages. The symptoms also last much longer. Sometimes they don’t disappear for at least two weeks.
Flu can be a deadly disease. The elderly, who are weaker and less healthy than most younger people, can die from flu. This is one reason why old people are advised to have a flu injection (预防针) before the start of winter when flu is most common. This injection is inexpensive and definitely worth it.
If you have a cold or flu, you must always deal with used tissues (纸巾)carefully. Don’t leave dirty tissues on your desk or on the floor. Someone else has to pick these up and viruses could be passed on. And finally, remember to cover your nose and mouth when you sneeze! You don’t want to see the small drop of liquids blown out of your nose and mouth when you sneeze, do you? Disgusting, eh? Now you can understand why it’s a good idea to cover your nose and mouth when you sneeze!
60. According to the passage, people with colds hardly get _______.
A. a headache B. a high fever C. a running nose D. aching muscles
61. In paragraph 4, we learn that _______.
A. flu injection can cause death B. most old people die from flu
C. flu is most common in summer D. flu can kill old people easily
62. Dealing with used tissues properly is important because _______.
A. it helps keep your classroom tidy B. people hate picking up dirty tissues
C. it prevents the spread of colds and flu D. picking up lots of tissues is hard work
63. Which of the following statements is true according to the passage?
A. Both colds and flu last the same time.
B. Both colds and flu can be prevented by injection.
C. Both colds and flu are caused by the same viruses.
D. Both colds and flu have an aching symptom.
Organization are calling for everyone to practice smart flu prevention
techniques. Besides washing your hands and getting enough sleep,
here are the other 7 ways to keep your body strong and your immune
(免疫) system ready to fight infection.
Avoid Contact with Sick People
Flu virus is spread when particles (微粒) blown into the air through a cough or sneeze reach someone else’s nose. So if you’re coughing or sneezing, cover your mouth and then wash your hands, and if you have to be around someone who is sick, try to stay a few feet away from them and avoid physical contact.Eat Immune – Boosting Foods
Keeping your body strong and ready to fight infection is important in flu prevention. Fatty foods can make you feel lazy, and make your immune system working in an inactive and compromised way. So stick with wholes grains, colorful vegetables, and vitamin – rich fruits.
Avoid Alcohol
In addition to being a mood calm and pleasant, alcohol is an immune restriction that can actually decrease your resistance to virus infections like AH1N1flu. So avoid alcohol to keep your immune system strong.
Drink Enough Water
Drink 8 – 10 glasses of water each day to wash out poisonous things from your system and maintain system in a good state,
Keep Physically Active
Adequate exercise – for example walking for 30 to 40 minutes 3 or 4 times a week – supports the immune system by increasing circulation, speeding the body’s oxygen – taking – in, taking away poisonous things through sweat, and releasing tension and stress. So get moving!
Be Careful of Surfaces
This is as much a mindfulness exercise as anything else. Be aware of what public surfaces you touch, when you’ve shaken hands with someone, or when you’re using something like a pen that others have recently used – and don’t touch your face until you’ve had a chance to wash your hands.
Know When to Get Help
AH1N1 flu can look like regular flu, so don’t feel like you necessarily are infected if you’re exhibiting flu – like symptoms. But do consult your doctor if your symptoms are severe.
|
65.How can fatty foods affect a person? .
A.They cause human’s immune system inactive
B.They help to keep one’s body strong
C.They are good for fighting infection
D.They are favorable for a calm mood
66.Drinking water and having enough exercise play the similar role in .
A.increasing circulation B.taking in more oxygen
C.cleaning your system D.reducing your pressure
67.What does the author strongly suggest in the last paragraph?
A.Don’t touch your face! B.Avoid using others’ pen!
C.Don’t fear getting infected! D.See a doctor if you’re seriously ill!
D
If you want to live longer and lower the risk of heart disease, a move to the mountains may help. Research by scientists in Greece shows that living in the mountains is good for the heart and longevity. People living at higher altitude have lower possibility of dying from heart disease than those closer to sea level, even if they have factors that could increase their risk."Residence in mountainous areas seems to have a "protective effect" from heart disease," said Dr Nikos Baibas of the University of Athens.He and his colleagues suspect that the increased exercise from walking up mountainous area gives the heart a good workout and enables it to cope with lower levels of oxygen.
Researchers studied the health records and death rates of 1,150 Greeks who lived in three villages near Athens over 15 years.One village was 1,000 metres above sea level and the other two were in low-lying areas.Although men and women living in the mountainous village had higher blood pressure rates and other risk factors than people in the other villages, they had a lower rate of death from heart disease and other causes after a fifteen year follow-up."The contrast was more evident among men than among women," Baibas added in a report in the Journal of Epidemiology and Community Health.Heart disease is one of the world"s top killers.Smoking, high blood pressure, raised cholesterol levels, being overweight or obese and a family history of the illness increase the odds of developing the disease.
68.The first sentence in the passage is used to __________.
A.tell readers what the passage focuses on
B.give a very good guessing
C.warn people of the risk of heart disease
D.name a new unknown illness
69.According to the passage, a person _________ may have less possibility of having heart attack.
A.with more money B.with a better living habit
C.from higher altitude D.in a happier mood
70.How long does the research of the Greeks last?
A.At most 10 years. B.About 15 years.
C.More than 20 years. D.Not mentioned.
71.Apart from altitude, how many factors raise the chance of developing heart disease?
A.three B.Four C.Five D.Six
最新试题
- 1如图,小明想测量学校旗杆AB的高度,他采用如下方法:先将旗杆上的绳子垂到地面,还多1米,然后将绳子下端拉直,使它的末端刚
- 2实验室欲制取少量NaHCO3与NH4Cl。实验步骤如下请回答: (1)为了制取I、Ⅲ中需用的氨气,某同学设计了如图1 所
- 3重结晶过程中如果所选溶剂对杂质的溶解度很小,而对被提纯有机物的溶解度比较大,那么热过滤后A.被提纯有机物在滤液中B.杂质
- 4某同学在铁锅内洗完碗后,未将水倒掉,第二天发现铁锅内沿水面出现了一圈铁锈,该事实说明:钢铁常温下接触______和___
- 516的平方根是______;用科学记数法表示:-0.00168≈______(保留两个有效数字)
- 6人体细胞同植物细胞明显的区别是( )A.呈圆形B.没有细胞壁C.没有细胞质D.细胞形态差别很大
- 7 北京时问2004年12月26日上午8时59分,苏门答腊岛附近海域(3.9°N,95.9°E)发生了里氏8.9级大
- 8为了检验淀粉水解的产物,设计如下实验方案:请回答下列问题:(1)试剂1为20%的H2SO4溶液,其作用是
- 9Only when ______ the data again ______ that there was a mist
- 10阅读下文,完成文后各题。韩令坤,磁州武安人。父伦,少以勇敢隶成德军兵籍,累迁徐州下邳镇将兼守御指挥使。世宗以令坤贵,擢陈
热门考点
- 1如图,矩形中,,,为上的点,且.(Ⅰ)求证:;(Ⅱ)求证;;(Ⅲ)求三棱锥的体积.
- 2下列属于神经系统的中枢部分的是( )①脑②脑神经③脊髓④脊神经.A.①②B.①③C.②④D.③④
- 3We will see _ even stronger China in near
- 4Oh, Jack, _________________ you gave us!A.How a pleasant sur
- 5煤矿的矿井里为了防止“瓦斯”(甲烷)爆炸事故,应采取的安全措施是( )A.通风并严禁烟火B.进矿井前先用明火检查是否有
- 6Some amazing people _______ our world for the better in the
- 7袋中装有黑球和白球共7个,从中任取2个球都是白球的概率为,现有甲、乙两人从袋中轮流摸取1个球,甲先取,乙后取,然后甲再取
- 8 Don"t park your car here, please. It"ll ________ the traffi
- 9有关经线和纬线的说法, 正确的是A.经线指示东西方向, 经线长度都相等 B.纬线指示南北方向, 纬线长度不相等C.0o经
- 10【题文】阅读下面一幅漫画《新老乌鸦喝水比赛》请概括漫画揭示的含义。要求:语言准确、鲜明,不超过20字。(4分)漫画《新老