Scientists have discovered thirteen kinds of vitamins. They say vitamins help to carry out chemical changes within cells. If we do not get enough of the vitamins we need in our food, we are at risk of developing a number of diseases. Which foods should be eaten to keep us healthy? Let us look at some important vitamins.

Vitamin A helps prevent skin and other tissues from becoming dry. People who do not get enough vitamin A cannot see well in darkness. Vitamin A is found in fish liver oil and the yellow part of eggs.

Vitamin B-1 is also called thiamine. Thiamine changes starchy（含淀粉的）foods into energy. Thiamine is found not just in whole grains like brown rice, but also in beans and peas, nuts, and meat and fish.

Vitamin B-12 is needed so folic acid can do its work. Together, they help produce red blood cells. Folic acid has been shown to prevent physical problems in babies when taken by their mothers during pregnancy. Vitamin B-12 is found naturally in foods like eggs, meat, fish and milk products. Vitamin B-12 is found in green leafy vegetables and other foods, like legumes and citrus fruits （柑橘類水果).

Vitamin C is needed for strong bones and teeth. The body stores little vitamin C. So we must get it every day in foods such as citrus fruits, tomatoes and uncooked cabbage.

Vitamin D prevents the children’s bone disease rickets （佝僂�。�. Ultraviolet light from the sun changes a substance in the skin into vitamin D. Fish liver oil also contains vitamin D.

Vitamin K is needed for healthy blood. It thickens the blood around a cut to stop bleeding. It can also be found in pork products, liver and in vegetables like cabbage, kale and spinach （菠菜）.

Vitamins are important to our health. A lack of required vitamins can lead to health problems.

1.What is the main idea of the passage?

A. There are thirteen kinds of vitamins in total.

B. One can not live without enough vitamins.

C. Vitamins can carry out chemical changes within cells.

D. Enough vitamins are vital to keep healthy.

2.Women who wish to become mothers should take in ________.

A. vitamin A B. vitamin B-1

C. vitamin B-12 D. vitamin C

3.What can change a substance in the skin into vitamin D?

A. Fish liver oil.

B. Ultraviolet light from the sun.

C. Fresh milk drunk by people.

D. Doing a certain amount of exercise.

4.According to the passage, taking in enough vitamin C can ________.

A. make our eyesight better

B. help to stop bleeding

C. make our bones and teeth strong

D. help produce red blood cells

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：2015-2016學(xué)年湖南衡陽八中高一下期中考試英語試卷（解析版） 題型：完形填空

完形填空

閱讀下面短文，從短文后各題所給的四個選項（A、B、C和D）中，選出可以填入空白處的最佳選項，并在答題卡上將該項涂黑。

Sometimes, people are required to fill in personal information when they register online, which may lead to some _________ trouble. Recently, the BBC is reporting that a 17-year-old girl in Australia posted a(n) _________ of her grandmother at home counting a large sum of cash that she _________ hidden in the house. Just eight hours later, two armed men _________the girl’s house. They demanded to speak to her to find out where the grandmother’s house was, _________ they could get the money they had seen. _________ , the girl was not home at the time, so the robbers _________a small amount of cash from the mother and left.

Because the _________ is still under _________ , local police aren’t saying much else about it. It’s not known yet whether the girl had used privacy setting on the Facebook profile page, and even whether the robbers_________ the girl in the past.

Two other _________ were at home then, a 58-year-old man and a 14-year-old boy, the girl’s father and brother. Luckily, no one was _________ . The robbers left peacefully after _________that the girl was not home and that no one else there knew anything about the _________ that had appeared in the photo.

Police in both Britain and Australia are using the case to _________citizens of the dangers of posting personal information on social networks and to suggest users of websites _________ doing so. The police say it is _________ that the girl posted a comment in the past that gave clues to the address, _________ that the robbers knew the girl in another way. _________ , they suggest, a posting by a friend on their site could have _________ such information. To find it, the robbers would only have had to search for those posting on other pages that contained the girl’s name.

1.A. clear B. known C. important D. unexpected

2.A. blog B. story C. picture D. video

3.A. got B. kept C. let D. made

4.A. knocked at B. looked at C. broke into D. ran into

5.A. even if B. in case C. as soon as D. so that

6.A. Usually B. Fortunately C. Suddenly D. Finally

7.A. left B. took C. spent D. asked

8.A. robber B. case C. family D. girl

9.A. discussion B. consideration C. control D. investigation

10.A. ignored B. remembered C. knew D. followed

11.A. neighbors B. members C. characters D. adults

12.A. killed B. escaped C. harmed D. buried

13.A. showing B. discovering C. looking D. recognizing

14.A. house B. website C. grandmother D. cash

15.A. excuse B. warn C. rob D. inform

16.A. stop B. consider C. keep D. enjoy

17.A. possible B. important C. necessary D. strange

18.A. so B. but C. and D. or

19.A. Therefore B. However C. Instead D. Besides

20.A. taken up B. given away C. put away D. set up

查看答案和解析>>

科目：高中英語 來源：2016屆陜西西安西北工大附中高三下第六次適應(yīng)性訓(xùn)練英語卷（解析版） 題型：閱讀理解

Grant Wood’s American Gothic caused a stir（轟動）in 1930 when it was exhibited for the first time at the Art Institute of Chicago and awarded a prize of 300 dollars. Newspapers across the country carried the story, and the painting of a farmer and a younger woman posed before a white house brought the artist instant fame.

In 1930, Grant Wood, an American painter with European training, noticed a small white house built in the small southern Iowa town of Eldon. Wood was so fascinated by it that he decided to paint the house along with the kind of people he thought should live in that house. In the painting, the farmer is modeled on his dentist. Dr. Byron McKeeby. His younger sister Nan served as a model for the woman （imagined to be the farmer’s wife or daughter）. Wood wanted to give a description of the traditional roles of men and women as the man is holding a pitchfork (干草叉) symbolizing hard labor. Each element was painted separately; the models sat separately and never stood in front of the house. The Gothic style of the house inspired the painting’s title.

American Gothic remains one of the most famous paintings in the history of American art. The painting has become part of American popular culture. Some believe that Wood used it to satirize（諷刺） the narrow-mindedness that has been said to characterize Midwestern culture. The painting may also be read as a praise of the moral virtue or rural America or even as a mixture of praise and satire. American Gothic is one of the few images to reach the status of cultural symbol, along with Leonardo da Vinci’s Mona Lisa.

1.What can we learn about American Gothic?

A．It won a prize of ￡300.

B．The two characters in it posed before the White House.

C．It was the first painting by Grant Wood.

D．It was on show at the Art Institute of Chicago in 1930.

2.From the passage we can infer Iowa is in __________.

A．the southern town of Eldon

B．the Midwest of the United States

C．a(chǎn) European country

D．the city of Chicago

3.Grant Wood chose the two models __________.

A．to describe traditional roles of men and women

B．to praise the moral virtue of rural America

C．to make his dentist and his sister famous

D．to carry the story across the country

4.The title of the painting is based on __________.

A．the name of a small town

B．the man and the woman

C．the Gothic style of the house

D．the pitchfork symbolizing hard labor

查看答案和解析>>

科目：高中英語 來源：2016屆江蘇揚州中學(xué)高三4月質(zhì)量監(jiān)測英語試卷（解析版） 題型：單項填空

—Do you have any idea why Jenny left the firm?

—Probably, she _______ for a pay rise, but was turned down.

A. has held out B. has been holding out

C. held out D. holds out

查看答案和解析>>

科目：高中英語 來源：2016屆河南焦作高三第一次模擬考試英語試卷（解析版） 題型：短文改錯

短文改錯

假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文。文中共有10處錯誤，每句中最多有兩處。錯誤涉及一個單詞的增加、刪除或修改。

增加：在缺詞處加上一個漏詞符號（∧），并在此符號下面寫出該加的詞。

刪除：把多余的詞用斜線（＼）劃掉。

修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞。

注意：1．每處錯誤及修改均僅限一詞；

2．只允許修改10處，多者（從第11處起）不計分。

It was extreme cold last Monday morning. While I was walking in my way to school, I noticed two street cleaner sweeping the street. Seeing them are working so hard on such a cold morning, I was moved and made up my mind do something for them. After arriving at school, I discussed with some classmates that we could do. The next day, we got up early and preparing porridge at home. When we handed the cleaners the hot porridge and expressed us appreciation for their hard work, they looked a little surprising at first. And then they took the porridge and thanked us happily. Since it was very cold, we all felt warm at that moment.

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年重慶一中高二 4月考英語試卷（解析版） 題型：單詞拼寫

單詞拼寫

1.I’m sorry sir. You can’t sit here because this table is r__________ (預(yù)訂的).

2.The matches between Manchester United and Liverpool are always ________ (值得) watching.

3.It appears that all second-hand cars for sale on that website are in perfect ________ (狀況).

4.The teacher wants the children to ask questions ________ (自信地) whenever they don't understand.

5.As a result of the death of his parents, love was totally a________ (不存在的) from his childhood.

6.We would like to sincerely ________ (道歉) for the late departure of this flight.

7.At the dancing, Mr Darcy ________ (表現(xiàn)) like a true gentleman and impressed everyone.

8.I didn't ________ (猶豫) for a moment about taking the job.

9.He is too ________ (固執(zhí)的) to admit that he was wrong.

10.The ________ (擁有) of a passport is essential for foreign travel.

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年重慶一中高二 4月考英語試卷（解析版） 題型：閱讀理解

I could still remember that hot afternoon when my mother ordered me to walk to the public library, and borrow at least one book for the summer. In this way, she hoped to defeat my strange problem — inability to read.

In the library, I found my way into the “Children's Room.” I sat down on the floor and pulled a few books off the shelf. The cover of a book caught my eye. It presented a picture of a beagle. I had recently had a beagle, the first and only animal friend I ever had as a child. He was my secret sharer, but one morning, he was gone, given away to someone who had the space and the money to care for him. I never forgot my beagle.

There on the book's cover was a beagle which looked similar to my dog. I ran my fingers over the picture of the dog on the cover. My eyes ran across the title, Amos, the Beagle with a Plan. Unknowingly, I had read the title. Without opening the book, I borrowed it from the library for the summer.

Under the shade of a bush, I started to read about Amos. I read very, very slowly with difficulty. Though pages were turned slowly, I got the main idea of the story about a dog who, like mine, had been separated from his family and who finally found his way back home. That dog was my dog, and I was the little boy in the book. At the end of the story, my mind continued the final scene of reunion, on and on, until my own lost dog and I were, in my mind, running together.

My mother's call returned me to the real world. I suddenly realized something: I had read a book, and I had loved reading that book. Everyone knew I could not read. But I had read it. Books could be so wonderful. I was going to read them.

I never told my mother about my wonderful experience that summer, but she saw a slow but remarkable improvement in my classroom performance during the next year. And years later, she was proud that her son had read thousands of books, was awarded a PhD in the literature, and published his own books, articles, poetry and fiction. The power of the words has held.

1.The author's mother told him to borrow a book in order to ___________.

A. help cure him of his reading problem

B. encourage him to do more walking

C. let him spend a meaningful summer

D. make him learn more about animals

2.The author managed to read the book through because .

A. he was forced by his mother to read it

B. the book told the story of his pet dog

C. the book reminded him of his own story with his dog

D. the happy ending of the story attracted him

3.What can be inferred from the last paragraph?

A. The author's mother read the same book.

B. The author has become a successful writer.

C. The author has had happy summers ever since.

D. The author's mother rewarded him with books.

4.Which one can be the best title of the passage?

A. The Charm of a Book B. Mum's Strict Order

C. Reunion with My Beagle D. My Passion for Reading

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年吉林實驗中學(xué)高二下期中考試英語卷（解析版） 題型：短文改錯

短文改錯

假定英語課上,老師要求同桌同學(xué)相互修改作文。假設(shè)以下小作文為你同桌所寫，請你對其進行修改。文中共有10處錯誤，每句中最多有兩處。錯誤涉及一個單詞的增加、刪除或修改。

增加：在缺詞處加一個漏詞符號（^），并在此符號下面寫出該加的詞。

刪除：把多余的詞用斜線（\）劃掉。

修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞。

注意：1. 每處錯誤及其修改均僅限一詞。

2. 只允許修改10處，多者（從第11處起）不計分。

3. 必須按答題要求做題，否則不給分。

English is my weak subject. I almost failed in all the English tests in last term, that made me worried and discouraged. Know that I was in low spirits, Mr. Li, who is in the charge of my class, advised me to read an article. I finished reading it immediate. It was a true story about a girl student who lost all her arms and a leg at the age of five. But she didn’t lose her heart. Instead, she smoothed away various discomforts and learn to write with her only foot. I was deeply moved by his story. Now I have made up my minds to learn English well.

查看答案和解析>>

科目：高中英語 來源：2015-2016學(xué)年廣東汕頭金山中學(xué)高二下期中考試英語卷（解析版） 題型：單項填空

__________ to sun, rain and wind for a long time, the stone split.

A. Being exposed B. Having exposed

C. Exposed D. To expose

查看答案和解析>>

同步練習(xí)冊答案