Vitamin D helps bones and muscles grow strong...

Vitamin D helps bones and muscles grow strong and healthy．Low levels of vitamin D can lead to diseases such as rickets(软骨病), mainly found in children．The thinning of bone is a common problem as people, especially women, get older．

But more and more research is suggesting that vitamin D might also help prevent many diseases．The easiest way to get vitamin D is from sunlight．The sun’s ultraviolet(紫外线的)rays react with skin cells to produce vitamin D．But many people worry about getting skin cancer and skin damage from the sun．As a result they stay out of the sun．Also, darker-skinned people produce less vitamin D than lighter-skinned people．The amount also de-creases in older people and those living in northern areas that get less sunlight．

Not many foods naturally contain vitamin D．Foods high in this vitamin include oily fish and fish liver oils．Farmed fish have only about one-fourth as much vitamin D as wild fish．Small amounts of vitamin D are found in beef liver, cheese and egg yolks．But most of the vitamin D in the American diet comes from foods such as milk．

Research in the last several years has shown that low levels of vitamin D may increase the risk of heart attacks in men and deaths from some cancers．More doctors are now having their patients tested for their vitamin D levels．But as research continues, some experts worry that if people take too much vitamin D, it might act as a poison, Also, skin doctors warn people be careful with sun exposures because of the risk of skin cancer．

1.The first paragraph is mainly about________．

A．the muscle diseases                        B．the sources of vitamins

C．the importance of health                    D．the functions of vitamin D

2.Which of the following people produce the least amount of vitamin D?

A．Elderly darker-skinned people．

B．Young lighter-skinned people．

C．Elderly lighter-skinned people．

D．Young darker-skinned people．

3.People can get the most vitamin D from________．

A．beef liver           B．cheese               C．wild fish           D．farmed fish

4.What can we infer from the text?

A．Being exposed to sunlight is the safest way to get vitamin D

B．Lack of vitamin D can make people age quickly

C．Proper vitamin D levels people need are still not determined now．

D．The vitamin D level is higher in men than in women．

高三英语阅读理解中等难度题查看答案及解析

Teeth are important．Strong，healthy teeth help you chew foods that help you grow．They help you speak clearly．And，they help you look your best．Here are some tips for you to take care of your teeth．

1．Brush your teeth on the right way．

Brush your teeth at 1east twice a day—after breakfast and lunch or after sweet snacks，too．

Brush all of your teeth，not just the front ones，Spend time brushing teeth along the sides and back of your mouth．Brush away from your gums，too．

Spend at least three minutes each time you brush．Play a song you like to help pass the time．Get a new toothbrush every three months．When you buy your toothbrush，be sure it has soft bristles（毛）．

2．Learn how to floss your teeth．

Flossing is a very important way to keep your teeth healthy．Food may hide in places where a toothbrush cannot get to，like the space between two teeth．Flossing can help get rid of it．Carefully move floss between two teeth．Up and down．You’11 need to floss your teeth at least once a day．

3．Have good eating habits．

You need to be careful about what you eat and drink。Eating sugar is a major of   tooth decay（腐败）．Eating sugar before you go to bed can make things even worse，eat lots of fruit and vegetables and drink water instead of soda．

67．The passage is mainly about          ．

A．how to take care of your teeth

B．how to brush your teeth

C．how to form good eating habits

D．how to floss your teeth

68．The underlined word “tips” in this passage means          ．

A．money given to the waiter for personal services

B．piece of advice on how to do something

C．light blow，tape

D．thin end of something

69．When you brush your teeth．at least           minute（s）is necessary．

A．1                                     B．2                                     C．3                                     D．4

70．Which is NOT mentioned in this passage？

A．Flossing your teeth．                                              B．Having good eating habits．

C．Brushing your teeth．                                       D．Going to see the dentist．

71．Which of the following statements is NOT true according to this article？

A．We should brush our teeth at least twice a day．

B．Flossing can help to get rid of the food hidden between two teeth．

C．One of the major causes of tooth decay is eating sugar．

D．We don’t have to brush our teeth if we eat a lot of fruit and vegetables．

高三英语阅读理解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

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

Understanding the basic tips on growing grass will help you create a healthy and green lawn. If you plan the right variety at the right time and in the right place, you’ll achieve success.

Autumn is the ideal growing season for the majority of grass varieties. Prepare the soil in this season as you do for any other plant. Based on the type of grass that you have chosen, the nutrient requirements may differ. For poor soil that is lack of essential plant nutrients, you can supply it with some organic fertilizer.

To grow grass successfully, make sure you select the correct variety that will adapt to the soil conditions of your area and to the growing location. You can choose the American shade grass variety or native grass varieties.

The sowing of grass can be done on bare soil or on an existing lawn. After sowing the grass seeds, cover them with a layer of top soil to quicken the germination (萌芽) process. In the first few weeks, you should irrigate the area every other day. Reduce the watering frequency after the grass has germinated. The addition of proper fertilizers at the right time is necessary for the healthy growth of grass. In the case of grass growing in shady environments, limit the use of fertilizers.

Weed control is another important tip for growing grass. The presence of weeds in grass growing areas leads to competition for water and nutrients, thus resulting in the poor growth of the planted grass. Hence, in order to avoid this condition, ensure that you remove the weeds regularly.

Lastly, one should also watch out for the presence of diseases and pests around the grass growing site in order to preserve the beauty of the lawn.

Advice on How 　　 1.　　

I. Rule of thumb

★plant the right variety at the right time and in the right place

II. 　　 2.　　

★choose the soil in 　　 3.　　 , which is the ideal grass growing season

★add organic fertilizer to poor soil lacking essential plant nutrients

III. Grass variety

★select the correct variety 　 4.　　 the soil condition and growing location

IV. Sowing

★sow grass seeds over soil and cover them with a layer of top soil to make the grass seeds 　 5.

V. 　　 6.　　 and Fertilization

★irrigate the area every other day and reduce the watering frequency after germination

★　　 7.　　 proper fertilizers but limit the use of fertilizers in shady locations

VI. 　　 8.　　

★remove weeds regularly to 　　 9.　　 competition for water and nutrients

VII. Disease control

★　　 10.　　 to the presence of diseases and pests to preserve the beauty of the lawn

高三英语其他题中等难度题查看答案及解析

Humans were made for walking. With our upright posture and strong leg muscles, our bodies were actually designed with walking in mind which makes it such perfect exercise. It’s kind to our bodies and great for our waistlines. 1.

Maybe you already love to walk, but you’re getting tired of tracing the same old route day after day, or maybe you’re new to walking and aren’t sure how to get started. 2.Ask yourself, what do you want to get out of walking aside from the health benefits? Do you want to meet other people? See new places? Get out into the countryside or explore a new city? Knowing your goals will help you decide on the type of walk you want to do.

If making friends and socializing is your goal, call up your friends and schedule walks with them.3. Many malls have groups that come every day, or every weekend, to “walk the mall.” These groups are always happy to include one more walker!

4.Many large cities have incredible gardens and parks that include quiet walking trails getting you off the beaten path. Thanks to the Rails to Trails program, railways across the country are being transformed into scenic walking paths that are a perfect way to seek calmness.

From the benefits to your heart to your overall happiness, walking is just plain good for you.5.It’s a fantastic way to get to know a place by the power of your own two feet.

A.Headed to a new city?

B.This month, pick up a map and start walking.

C.Ask your friends where they like to walk and just go there.

D.Either way, it's time to accept the idea of walking with a purpose.

E.And best of all, it’s a great way to see new things and meet new people!

F.Recently, science has proved that walking is good for your body shape.

G.If you're after walking alone, ask about local hikes that get you out of town and into the countryside.

高三英语七选五中等难度题查看答案及解析

Humans were made for walking. With our upright posture and strong leg muscles, our bodies were designed with walking in mind --- which is what makes it such perfect exercise. 1.And best of all, it’s a great way to see new things and meet new people!

2.Wherever you are, in the city or at the campground, you’ll find plenty of walking going on. Studies have shown that taking a walk every day significantly reduces your risk for heart disease and high blood pressure, and it even lowers stress levels. Recently, science has proved that walking is even good for your body shape and brain.

To get started, sit down with a map and make a plan. 3.Do you want to meet other people? See new places? Get out into the wilderness or explore a city? Knowing your strengths will help you decide on the type of walk you want to do.

If making friends and socializing is your goal, call up your friends and schedule walks with them. Ask your friends where they like to walk and go there, since this will introduce you to new places. Go online and look up your local mall or shopping center. Many malls have groups that come every day, or every weekend, to “walk the mall. 4.

From the benefits to your heart to your overall happiness, walking is just plain good for you.

This month pick up a map and start walking.5.

A.Headed to a new city?

B.It’s good for our bodies and great for our waistlines.

C.This month, why not focus on walking with a purpose?

D.These groups are always happy to include one more walker!

E.You might find open groups of dog walkers at your local park.

F.It’s a fantastic way to get to know the world, using your own two feet.

G.Ask yourself, what do you want to get out of walking aside from the health benefits?

高三英语七选五中等难度题查看答案及解析

Buck did not know that there was trouble ahead, Trouble for every dog with strong muscles and warm long hair, from Seattle to southern California. Some men had found a yellow metal in the Arctic darkness, and thousands of other men were rushing there. These men wanted dogs that were heavy, with strong muscles for working hard and furry coats to protect them from the cold.

Buck lived at a big house in a sunny valley in California which was owned by Judge Miller. He was neither a house dog nor a kennel (狗窝) dog. The whole of Judge Miller's land was his. Buck was king---king over all the crawling, flying things of Judge Miller's lands, humans included.

His father, Elmo, had been the Judge's inseparable companion. And when he died, Buck took his father’s place. He was not so large---he weighed only sixty kilogram---for his mother, Shep, had been a Scottish sheepdog. Hunting and other outdoor activities had hardened his muscle, and swimming had made him healthy.

This was Buck in the autumn of 1897, when the discovery of gold in the Klondike brought Men from everywhere to the frozen north. But Buck did not read the newspapers. And he did not know that Manuel one of the gardeners helper, was not a good man. Manuel gambled (赌博) and wasted the little money he had. No one saw him and Buck go off on what Buck thought was a walk. No one saw them arrive at the railway station where Manuel sold Buck to a man who was waiting for him,

After two days ho was cried off the train in Seattle into a small, high-walled yard. There a fat man in a red sweater broke open the cage with a small axe (斧头)，while holding a club (棍棒) in the other hand. When there was a big enough opening, Buck jumped out like a red-eyed devil, straight at the fat man. But in mid-air, just as his teeth were going to close on the man, he received a shock that he had never felt before, It turned him over and onto the ground. He had never been struck by a club in his life, and he did not understand. He was smashed down a dozen times.

Buck saw that he stood no chance against the man with the club. He had learned the lesson, and for the rest of his life he never forgot it. It was his introduction into the world of primitive law.

In the end a small man called Perrault paid three hundred dollars for him, and he was led away with Curly, a good-natured Newfoundland dog.

1.What kind of dogs did the gold-seekers want?

A.Heavy house dogs with yellow hair. B.Strong long-haired dogs.

C.Diligent dogs with yellow hair D.Muscular kennel dogs.

2.Buck was proud of himself for the following reasons, EXCEPT that ______.

A.he was king over all living things of Judge Miller's lands

B.he became the Judge's inseparable companion after his father's death

C.he had a good life with many outdoor activities to get strong and healthy

D.he was wanted by gold-seekers thanks to his strong muscles and long hair

3.Which of the following statements is true according to the passage?

A.Judge Miller owned a big house and a large piece of land in the Klondike.

B.Manuel bought and sold Buck because he needed money to support his life.

C.The fat man cruelly beat Buck with a club to teach him how to fight back.

D.Buck's introduction into the word of primitive law was obeying the fat man.

4.What can be the suitable title for the excerpt?

A.Fall into Trouble B.Fight against a Man

C.Escape from Trouble D.Believe in a Man

高三英语阅读理解简单题查看答案及解析

Vitamin D is essential for bone-building,cognitive function,joint health,immune function,blood sugar control, positive mood and more.It can help prevent many diseases.Some studies suggest that the lower your vitamin D level is,the higher your risk of death from any cause will be.However,it's not a great idea to just grab a supplement（补充物）off the drugstore shelf and start taking it.

Since many of us are deficient in vitamin D,also known as the "sunshine vitamin”,doctors will often give us a prescription（处方）for high levels of vitamin 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.But like all good things,it's possible to get too much of it."Very big doses of vitamin D can cause a build-up of calcium in the blood,which leads to nausea,vomiting,poor appetite,weakness,and weight loss,"says Madeline Basler of Real You Nutrition.Here's the bigger issue: any extra intake of,vitamin D can get stored in the body."A build-up of stored vitamin D can cause avoidable problems,"says Marra Francis,Medical Director at Everly Well,"leading to problems such as kidney stones."

The average daily recommended amounts vary based on your age.The National Institutes of Health set the Recommended Dietary Allowance for vitamin D at 600 IU daily for infant,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.People who are obese may also need more vitamin D because the fat cells take it up,making it less available for use by the body.In winter when you're getting less sun exposure,some experts say it's safe to take daily doses of around 1,000 to 2,000 IU without any risk of complications（并发症）.

Though you'll get a bit of vitamin D from foods—including fatty fish beef liver,cheese,egg yolks and mushrooms,plus fortified foods like milk,orange juice,and cereal—the amounts are so small that there's little need to worry that they’ll put you over the daily does.

1.What can we infer from Paragraph 1?

A. We can actually reduce the risk of death.

B. People don't really know vitamin D well.

C. Vitamin D supplements are necessary for everyone.

D. Vitamin D should be supplemented carefully despite its importance.

2.The underlined part "are deficient in" in Paragraph 2 probably means “　　　　 ”.

A. having an inadequate amount of　　 B. paying much attention to

C. being interested in　　 D. being concerned about

3.How much vitamin D should a healthy 60-year-old lady take daily in summer?

A. About 800 IU.　　 B. About 600 IU.

C. No less than 1,000 IU.　　 D. No less than 5,000 IU.

4.What does the last paragraph mainly talk about?

A. What other ways people can take to get vitamin D.

B. What foods we should eat every day to balance our diets.

C. Whether daily foods would overdose people with vitamin

D. D.Whether vitamin D can be supplemented by the foods we eat.

高三英语阅读理解中等难度题查看答案及解析

Vitamin D helps our bodies make a special chemical，and this special chemical, ______

affects our brains，making us feel happy．

A．in turn          B．in particular         C．in advance         D．in short

高三英语单项填空简单题查看答案及解析