The vitamins necessary for a healthy body are normally supplied by a good mixed diet, including a variety of fruits and green vegetables. It is only when people try to live on a very restricted diet, say that when trying to lose weight, that it is necessary to make special provisions to supply the missing vitamins.
An example of the dangers of a restricted diet may be seen in the disease known as "beri-beri", which used to make large numbers of Eastern people who lived mainly on rice suffer. In the early years of last century, a Dutch scientist named Eijkman was trying to discover the cause of beri-beri. At first he thought it was transmitted by a germ (病菌) . He was working in a Japanese hospital, where the patients were fed on polished rice which had had the outer coverings removed from the grain, it was thought this would be easier for weak and sick people to digest.
Eijkman thought his germ theory was proved when he noticed the chickens in the hospital yard, which were fed on remains from the patients' plates, were also showing signs of the disease. He then tried to separate the germ, which he thought was causing the disease, but his experiments were interrupted by a hospital official, who ordered that the rice without coverings, even though left over by the patients, was too good for chickens. It should be recooked for the patients, and the chickens should be fed on cheap, rough rice with the outer coverings still on the grain.
Eijkman noticed that the chickens began to recover on the new diet. He began to consider the possibility that eating unmilled rice (糙米) somehow prevented or cured beri-beri--even that a lack of some ingredient (成分) in the coverings may be the cause of the disease. Indeed this was the case. The element needed to prevent beri-beri was shortly afterwards separated from rice coverings and is now known as vitamin B. The milled rice, though more expensive, was in fact causing the disease the hospital was trying to cure. Nowadays, this terrible disease is much less common thanks to our knowledge of vitamins.
1.What does the underlined word restricted mean?
A. balanced B. limited C. diverse D. complex
2.What do we know about the disease beri-beri?
A. It killed large numbers of people.
B. It resulted from lack of vitamins.
C. It was transmitted by milled rice.
D. It was caused by diseased chickens.
3.The ingredient missing from milled rice .
A. was vitamin B B. did not affect the chickens
C. did not result in beri-beri D. was named the Eijkman vitamin
4.What can be the best title of the passage?
A. A Good Mixed Diet B. The New Discovery of Eijkman
C. The Dangers of Beri-beri D. The Importance of Vitamins
高三英语阅读理解中等难度题
The vitamins necessary for a healthy body are normally supplied by a good mixed diet, including a variety of fruits and green vegetables. It is only when people try to live on a very restricted diet, say that when trying to lose weight, that it is necessary to make special provisions to supply the missing vitamins.
An example of the dangers of a restricted diet may be seen in the disease known as "beri-beri", which used to make large numbers of Eastern people who lived mainly on rice suffer. In the early years of last century, a Dutch scientist named Eijkman was trying to discover the cause of beri-beri. At first he thought it was transmitted by a germ (病菌) . He was working in a Japanese hospital, where the patients were fed on polished rice which had had the outer coverings removed from the grain, it was thought this would be easier for weak and sick people to digest.
Eijkman thought his germ theory was proved when he noticed the chickens in the hospital yard, which were fed on remains from the patients' plates, were also showing signs of the disease. He then tried to separate the germ, which he thought was causing the disease, but his experiments were interrupted by a hospital official, who ordered that the rice without coverings, even though left over by the patients, was too good for chickens. It should be recooked for the patients, and the chickens should be fed on cheap, rough rice with the outer coverings still on the grain.
Eijkman noticed that the chickens began to recover on the new diet. He began to consider the possibility that eating unmilled rice (糙米) somehow prevented or cured beri-beri--even that a lack of some ingredient (成分) in the coverings may be the cause of the disease. Indeed this was the case. The element needed to prevent beri-beri was shortly afterwards separated from rice coverings and is now known as vitamin B. The milled rice, though more expensive, was in fact causing the disease the hospital was trying to cure. Nowadays, this terrible disease is much less common thanks to our knowledge of vitamins.
1.What does the underlined word restricted mean?
A. balanced B. limited C. diverse D. complex
2.What do we know about the disease beri-beri?
A. It killed large numbers of people.
B. It resulted from lack of vitamins.
C. It was transmitted by milled rice.
D. It was caused by diseased chickens.
3.The ingredient missing from milled rice .
A. was vitamin B B. did not affect the chickens
C. did not result in beri-beri D. was named the Eijkman vitamin
4.What can be the best title of the passage?
A. A Good Mixed Diet B. The New Discovery of Eijkman
C. The Dangers of Beri-beri D. The Importance of Vitamins
高三英语阅读理解中等难度题查看答案及解析
第二节: 语法填空
Vitamins are a group of substances(物质)found in food. The body needs them for life and health. So usually, many people care for the question: am I getting enough vitamins, and am I getting the right kind?
Even though very small amounts of each vitamin are enough for the needs of the body, the worry people have about vitamins has some reasons. And this has to do with their ___11_ --- the food they take in. A person eating a good variety of food get all the vitamins now ___12 ___ (know) to be needed.
The problem is that there are many people who don’t ___13_ __ foods wisely. So the answer ___14 ___ this question is: No extra ___15_ __ are needed, ___16 __ you eat proper foods. In fact, many of the vitamins cannot be ___17_ __(store) in the body, so when extra vitamins are taken in, the body simply gets rid of them. It is even ___18 ___ (harm) to put too much of certain vitamins into the body. This has been found to be ___19 (truth) of vitamin A and D, when ___20 ___ amounts are taken in.
高三英语其他题简单题查看答案及解析
_______naturally by the skin when exposed to sunlight, Vitamin D is needed for healthy bones, teeth and muscles.
A. Making B. To make
C. Made D. Make
高三英语单项填空困难题查看答案及解析
E
After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers from the activities of the day. The rest that you get while sleeping makes it possible for your body to prepare itself for the next day.
There are four levels of sleep, each being a little deeper than the one before. As you sleep, your body relaxes little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts(变换) back and forth from one level to the other.
Although your mind slows down, you will dream from time to time. Scientists who study sleep point out that when dreaming occurs, your eyeballs begin to move more quickly (although your eyelids are closed). This stage of sleep is called REM, which stands for rapid eye movement.
If you have trouble falling asleep, some people recommend(建议) breathing very slowly and very deeply. Other people believe that drinking warm milk will make you drowsy. There is also an old suggestion that counting sheep will put you to sleep.
49. During REM, ______
A. you move restless B. you start dreaming
C. your mind stops working D. your eyeballs move quickly
50. A good title for this text might be_________
A. Dreams B. Sleep C. Good Health D. Work and Rest
高三英语阅读理解简单题查看答案及解析
Vitamin D is necessary for bone-building, immune function, blood sugar control, positive mood and more. 1. The lower your vitamin D level is, the higher your risk of death from ally cause will be. However, it’s not a great idea to just take a supplement (补品) off the drugstore shelf and start taking it.
Since many of us have an inadequate amount vitamin D, also known as the “sunshine vitamin”, doctors will often give us high levels of D supplements, with doses ranging from 2,000 to 10,000 IU (International Units) per day, up to 50,000 IU per week and sometimes even more. 2. Very big doses ( 剂量) of vitamin D can cause a build-up of calcium ( 钙) in the blood, which leads to poor appetite, weakness, weight loss or other diseases. Here’s the bigger issue: 3. A build-up of stored vitamin D cart cause avoidable problems, leading to problems such as kidney stones.
4. The National Institutes of Health set the Recommended Dietary Allowance for vitamin D at 600 IU daily for babies, children, and adults up to 70 years old. Adults aged 71 and older need 800 IU, since the ability to absorb vitamin D drops with age. Because the fat cells take vitamin D up, making it less available for use by tile body, 5.
Though you’ll get a bit of vitamin D from foods—including fatty fish, beef liver, cheese, milk and so on—the amounts are so small that there’s little need to worry that they’ll put you over the daily dose.
A.It can help prevent many diseases.
B.We can actually reduce the risk of death.
C.people who are fat may also need more vitamin
D.any extra intake of vitamin D can get stored in the body.
E.But like all good things, it’s possible to get too much of it.
F.The average daily recommended amounts vary based on your age.
G.Vitamin D should be supplemented carefully despite its importance.
高三英语七选五中等难度题查看答案及解析
Watercress is positively packed with healthy vitamins and minerals. The writings of both the Romans and the Ancient Greeks record the consumption of watercress by all classes. Hippocrates, “the father of medicine”, was so convinced that watercress was a great healer that he built his first hospital next to a stream so that he could grow a plentiful supply of the shiny green leaves for his patients. The Romans chewed watercress in large quantities, believing that it would cure baldness. They, too, looked with favor on watercress as a salad.
Watercress sandwiches were traditionally a breakfast item in nineteenth-century Europe. The most basic type of watercress sandwich has two pieces of white bread with a mixture of butter and watercress greens . A nickname(绰号)for the vegetable, in fact, was “poor man’s bread”, because watercress was often eaten on its own for breakfast by families that could not afford the bread to go with it.
Watercress is a member of the mustard(芥菜) family. It contains vitamins C(66mg per 100g), K and A, and is also a valuable source of minerals such as iron, potassium, copper and calcium. The mustard oils in its silky leaves and stems(茎)contain an ingredient known as PEITC. Recent research has proved that PEITC can prevent the growth of cancer cells and, in some cases, actually destroy them.
The best watercress has silky green leaves without any marks and has undamaged stems, The older the plant, the darker are its leaves and the thicker its stems. This means a higher concentration of oils and vitamins. Young watercress, on the other hand, may be harvested after only twenty-eight days growth and has a milder taste. It is best to eat watercress fresh and raw , to keep more of its valuable nutrients, but it can be lightly cooked and used as an alternative to spinach—another dark green vegetable—in various recipes. From soups to salads, watercress is now considered around the world as a natural and healthy super food.
1.From paragraph 1, we can learn that________.
A.watercress is usually grown in wet areas
B.the ancient Greeks only used watercress for medicine
C.watercress is the most ancient vegetable known to man
D.the Romans rubbed watercress on their heads to cure baldness
2.The underlined word “it” in paragraph 2 refers to “_________”.
A.butter B.watercress C.breakfast D. bread
3.Which of the following is TRUE about watercress?
A.It belongs to the same family as spinach.
B.It contains mustard oils only in leaves.
C.It can help guard against cancer.
D.It is rich in vitamins C and B.
4.Compared with older watercress, young watercress.
A.has lighter green leaves
B.contains more minerals
C.is better for medical use
D.is more suitable for eating raw
5.What would be the best title for the text?
A.The history of watercress B.watrcress, a medicinal plant
C.Watercress, the amazing food D.New findings about watercress
高三英语阅读理解中等难度题查看答案及解析
______ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.
A. Put B. Putting C. Having put D. Being put
高三英语单项填空中等难度题查看答案及解析
Normally it’s necessary to know what pattern looks nice ___ the wall when picking the curtain.
A. on B. against C. with D. over
高三英语单项填空中等难度题查看答案及解析
X-rays are high energy waves that are invisible. 1.For example,doctors can see inside the human body and security guards at airports can see inside your handbag. In 1895,the German scientist,Wilhelm Rontgen,discovered X-rays by accident. He called them X-rays because he hadn't seen such a form of radiation before. 2.Wilhelm took the first X-ray picture of the bones of his wife's hand after the discovery. In 1901,he received the first Nobel Prize in Physics for his discovery.
X-rays are valuable in medicine because then can see through certain parts of the body. Doctors can take pictures to see which bones are broken or to find out which teeth have holes. The X-rays are strong enough to pass through the skin and muscles,but they cannot pass through hard objects like bones. In the picture,hard objects like bones are white area3.
There are some situations in which X-rays cannot give you a clear picture. Some organs,for example,may prevent X-rays from showing a broken bone. For this reason,computed tomography(CT)was invented. A person is put inside a scanner,which is a large tube-shaped machine. 4. A computer puts together all of these images,which can show doctors more than a normal X-ray can.
5.Patients must wear protective clothing for the parts of their body that are not X-rayed. Doc- tors and helpers who work with X-ray machines must wear lead aprons and stand behind screens.
A.Then the person is X-rayed from all sides.
B.Objects that X-rays go through appear dark.
C.In mathematics,X means something unknown.
D.An X-ray machine is used to take these pictures.
E.X-rays,however,can also do harm to your body.
F.However,they can be an essential tool for finding out what's wrong with you.
G.They are useful because they can pass through many things that normal light cannot.
高三英语七选五中等难度题查看答案及解析
阅读七选五
Trees around us are extremely important and have always been necessary for improving the human conditions. Our existing forests and trees we plant work to make a better world. 1.. Here is a short list of main reasons trees are necessary for improving our living conditions.
●Trees produce oxygen
2.. A leafy tree produces as much oxygen in a season as 10 people inhale in a year. What many people don't realize is that the forest also acts as a giant filter (过滤器) that cleans the air we breathe. Trees help clean the air by preventing airborne particles, reducing heat, and absorbing such pollutants.
●Trees clean the soil
The term phytoremediation is a fancy word for the absorption of dangerous chemicals and other pollutants that have entered the soil. 3.. Trees filter sewage and farm chemicals, reduce the effects of animal wastes, clean roadside spills and so on.
●Trees are carbon sinks
To produce its food, a tree absorbs and locks away carbon dioxide in the wood, roots and leaves. Carbon dioxide is a global warming suspect. 4.. This lockingup process “stores” carbon as wood and not as a “greenhouse” gas.
●5.
Trees block urban noise almost as effectively as stone walls. Trees, planted at strategic points in a neighborhood or around your house, can reduce major noises from freeways and airports.
A.We could not exist as we do if there were no trees
B.Trees help clean the sky
C.A forest is a carbon storage area that can lock up as much carbon as it produces
D.Trees control noise pollution
E.Man has been planting trees to make the planet a more beautiful world
F.The modern human community has other more practical reasons to admire and honor trees
G.Trees can either store harmful pollutants or change the pollutants into less harmful forms
高三英语信息匹配中等难度题查看答案及解析