Bad teeth can be painful and even be deadly. Infections of the gums(牙齦) and teeth can release bacteria into the blood system. Those bacteria can increase the chance of a heart attack or stroke and worsen the effects of other diseases. And adults are not the only ones at risk. For example, a 12­year­old boy died when a tooth infection spread to his brain in 2007 in Washington. Experts said it might have been prevented had he received the dental care he needed.
Experts say good dental care starts at birth. Breast milk, they say, is the best food for the healthy development of teeth. Breast milk can help slow bacterial growth and acid production in the mouth. But dentists say a baby's gums and early teeth should be cleaned after each feeding by using a cloth with a little warm water. Experts say if you decide to put your baby to sleep with a bottle, give only water.
When baby teeth begin to appear, you can clean them with a wet toothbrush. Dentists say it is important to find soft toothbrushes made especially for babies and to use them very gently. The use of fluoride(氟化物) to protect teeth is common in many parts of the world. For example, it is often added to drinking water supplies. The fluoride mixes with enamel(釉質(zhì)), the hard surface on teeth, to help prevent holes from forming.
But young children often swallow toothpaste when they brush their teeth. The American Academy of Pediatric Dentistry notes that swallowing fluoridated toothpaste can cause problems. So young children should be carefully watched when they brush their teeth. And only a small amount of fluoridated toothpaste, the size of a pea, should be used.
Parents often wonder what effect finger sucking might have on their baby's teeth. Dental experts generally agree that this is fine early in life. Most children stop sucking their fingers by the age of four. If it continues, experts advise parents to talk to their children's dentists or doctors. Because it could interfere_with the correct development of permanent teeth.
Dentists say children should have their first dental visit at least by the time they are one year old. They say babies should be examined when their first teeth appear—usually at around six months.
【小題1】According to the passage，what is the function of fluoride?

A．Making the surface on teeth much cleaner.
B．Protecting gums from being infected.
C．Keeping holes on teeth from forming.
D．Slowing down bacterial growth and acid production.
【小題2】The underlined phrase “interfere with” in Para.5 probably means “________”．
A．do harm to B．a(chǎn)ccount for
C．contribute to D．stand for
【小題3】What is the purpose of the author in writing the passage?
A．To warn us of the deadly infections of gums and teeth.
B．To introduce the advantages of fluoridated toothpaste.
C．To draw our attention to the dental care of young children.
D．To present the research results about dental care.


【小題1】C
【小題2】A
【小題3】C

解析【小題1】答案：C　細(xì)節(jié)理解題。根據(jù)第三段最后一句“The fluoride mixes with enamel(釉質(zhì))，the hard surface on teeth，to help prevent holes from forming.”可知，答案為C項(xiàng)。
【小題2】答案：A　詞義猜測(cè)題。根據(jù)上文中“大多數(shù)孩子到四歲就不吮吸手指了。但如果繼續(xù)的話，專家建議父母要去和孩子的牙醫(yī)或兒科醫(yī)生談一談”，以及該短語所在句的內(nèi)容可推知，do harm to“損害”與該短語的意思最為接近。
【小題3】答案：C　推理判斷題。根據(jù)最后一段的內(nèi)容可推知作者寫這篇文章旨在提醒父母要關(guān)注小孩子的牙齒健康。故選C項(xiàng)。
疑難詞匯解讀
1．bacteria n．細(xì)菌
bacterial contamination細(xì)菌感染
2．suck vt.吮吸，嘬
suck milk through a straw用吸管吸牛奶喝

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：閱讀理解

What is so different about Moisture Surge?
These hydrating formulas (保濕配方) rapidly make thirsty skin smooth and soft. Oil-free and fit for all skin types, they help:
Quickly increase skin’s moisture level with hydrating relief in a high-speed delivery system; Restore skin’s moisture balance;
Make up dry lines.
Moisture Surge Extended Thirst Relief
Rapid, long-lasting hydration in a refreshing oil-free gel(膠). Fast-absorbing formula locks in moisture all day and helps skin better resist dry despite great shifts in humidity. Use whenever, wherever needed, under or over makeup, or as a 5-minute moisture mask(面膜).
Moisture Surge Face Water Thirsty Skin Relief
Refreshing facial water. Great for use anytime, anywhere, under or over makeup.
Moisture Surge Extra Refreshing Eye GEL﹡
Cool and comfortable eye gel. Doctor-tested. Use whenever needed, under or over makeup.
Moisture Surge Facial Sheet Mask﹡
Refreshing, pre-moistened full-face sheet mask. Apply 1-2 times a week for a quick moisturizing. To use: unfold and apply to clean skin. Rest for 10 minutes, and then remove the mask.
Moisture Surge Refreshing Eye Mask﹡
Refreshing pre-moistened eye pads(墊). Apply 1-2 times a week to reduce under-eye puffiness(腫) and skin with quick hydration. To use: remove pads from packets and separate. Apply to clean under-eye skin. Rest for 10 minutes, and then remove pads.
Moisture Sheer Tint 15﹡
Refreshing, wash of color that hydrates and makes skin bright with special materials and SPF 15 sunscreen. Three skin-friendly shades wear beautifully alone or under makeup.
WARNING: keep out of eyes.
Stop use if any pain occurs. Keep out of reach of children.
Please pay attention to: ﹡stands for “Not available in all countries. ”
【小題1】According to the passage, Moisture Surge is the name of _______.

A．a(chǎn) product of eyesB．a(chǎn)n oil-free formula
C．a(chǎn) sun-blocking creamD．a(chǎn) series of skin care products
【小題2】What do we know about Moisture Surge Extra Refreshing Eye Gel and Moisture Surge Refreshing Eye Mask?
A．They can be used at any time.
B．They may be good for eyes.
C．They are a kind of gel.
D．They have been tested on doctors.
【小題3】Which of the following products can NOT be used over makeup?
A．Moisture Surge Face Water Thirsty Skin Relief
B．Moisture Surge Extra Refreshing Eye Gel.
C．Moisture Surge Extended Thirsty Relief
D．Moisture Sheer Tint 15.
【小題4】How many products mentioned in the passage can be bought all over the world?
A．TwoB．FourC．SixD．Eight

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Trip 1  Black Bear Count
There have been fires in this area in the last few years and the Office of the National Park is not sure how many black bears are still living. Some bears have been seen since the fires, and the Office has asked for young people to help count them.
The entire trip will last three hours. Bookings necessary.
Cost: Free                 When: May 8
Trip 2  Garland Valley
Bring your drink and lunch for this walk in a beautiful area of the Blue Mountains. Garland Valley is close to the town of Garland but is part of the National Park. Many wild animals live in this area, including many rare birds. This is a great walk for bird-lovers. The trip lasts four hours. Bookings necessary.
Cost: ＄ 15                 When: May 8, May 15
Trip 3  Flashlight Adventure
Put on your warm clothes, bring a flashlight and a pair of glasses, and come for a night walk along the Dungog Valley. A guide will lead the tour. Many of the animals you will see on this trip can only be seen at night. The guide will tell you about the lives of the animals you see. Numbers are strictly limited on night trips, so be sure to book early. This walk lasts two and a half hours.
Cost: ＄ 12               When: May 8, May 15, May 22
Equipment to be needed:
·Please bring enough water and food for all walks.
·Wear good walking shoes--no high heels.
·Wear a hat for day walks.
·Dress warmly for night walks.
·Children must be with an adult.
·Make sure your flashlight works well and bring extra batteries for night walks.
·Follow all instructions from guides during the walks. The mountains are a dangerous place.
Bookings:
·Bookings for the above trips can be done by telephone (893 - 4847) or on the Internet at (www. bluemountaintour, com)
【小題1】Where are these trips?

A．In a large city. B．In a park in the mountains.
C．In a special zoo. D．In three different countries.
【小題2】Which of the following is NOT necessary for the three trips?
A．Good walking shoes. B．A pair of glasses.
C．Food and water. D．A sleeping bag.
【小題3】What is the best title for the passage?
A．Adventure Travel in America
B．Hunting around the Great Mountains
C．Discovery Trips in the Blue Mountains
D．Interesting Trips in the East of the USA

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

A Healthy Habits Survey（調(diào)查）shows that only about one third of American seniors have correct habits. Here are some findings and expert advice.
1.How many times did you brush your teeth yesterday?
·Finding：A full 33% of seniors brush their teeth only once a day.
·Step：Remove the 300 types of bacteria in your mouth each morning with a battery-operated toothbrush. Brush gently for 2 minutes, at least twice a day.
2.How many times did you wash your hands or bathe yesterday?
·Finding：Seniors, on average, bathe fewer than 3 days a week. And nearly 30%wash their hands only 4 times a day-half of the number doctors recommend.
·Step：We touch our faces around 3,000 times a day-often inviting germs（病菌）to enter our mouth, nose, and eyes.Use toilet paper to avoid touching the door handle. And, most important, wash your hands often with hot running water and soap for 20 seconds.
3. How often do you think about fighting germs?
·Finding：Seniors are not fighting germs as well as they should.
·Step：Be aware of germs. Do you know it is not your toilet but your kitchen sponge（海綿）that can carry more germs than anything else? To kill these germs, keep your sponge in the microwave for  10 seconds.
【小題1】What is found out about    American seniors?

A．Most of then have good habits.
B．About one third of them brush their teeth only once a day
C．All of then are fighting germs better than expected .
D．Nearly 30%of then bathe three days a week .
【小題2】Doctors suggest that people should wash their hands          .
A．eight times a day B．three times a day
C．four times a day D．twice a day
【小題3】Which of the following is true according to the text ?
A．We should keep from touching our faces .
B．There are less than 300 types of bacteria in the mouth .
C．We should wash our hands before touching a door handle .
D．A kitchen sponge can carry more germs than a toilet .
【小題4】The text probably comes from             .
A．a(chǎn) guide book B．a(chǎn)n official document
C．a(chǎn) book review D．a(chǎn) popular magazine

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Losing weight comes with a lot of health benefits—including making your brain sharper.
Yes, it turns out that overweight may damage cognitive functions (認(rèn)知功能) such as memory and attention. There have been few studies of overweight and cognitive functioning, possibly because it is generally believed that it is not a primary risk cause for poor cognitive performance. Losing weight, therefore, may help improve these mental functions, according to a new research led by John Gunstad, assistant professor of psychology at Kent State University.
Growing evidence suggests that being fat is linked to cognitive deficits (缺陷). So Gunstad and his team guessed that losing weight might improve mental function. For their study, they measured memory and attention in a group of 150 overweight participants, some of whom had some kind of operation for weight loss and some did not. All of the volunteers completed mental skills tests to assess their abilities of memory and attention at the beginning of the study, and again 12 weeks later. To begin with, about 24% of the patients showed damaged learning and 23% showed signs of poor memory when tested. At the end of the study, those who had lost weight after operation improved their scores into the average or above average range for cognitive functions. Scores for the volunteers who didn’t lose weight dropped even further.
The study helped Gunstad to find out whether losing weight had any effect on mental function. Now that he’s seen the positive effect that weight loss can have on memory and attention, he says he will next study those who choose to lose weight by the traditional way—eating healthier and getting more active. He expects that losing weight in this way will have a similarly positive effect on the brain. “If we can improve the condition with operations, then we can probably produce the same change with behavioral weight loss as well,” he says.
【小題1】There is less research on overweight and cognitive functions because researchers _____.

A．believe overweight only affects our body
B．have focused on ways to sharpen people’s mind
C．do not consider overweight a main cause for low cognitive ability
D．a(chǎn)re clear about the relation between weight and mental functions
【小題2】The result of Gunstad’s study shows that ______.
A．losing weight has little effect on people’s memory
B．losing weight can improve people’s mental functions
C．overweight people are likely to have psychology problems
D．overweight people’s abilities of concentration differ greatly
【小題3】What is Gunstad planning to prove next in his research?
A．Slim people are smarter than overweight people.
B．Healthy diet is better than exercise in losing weight.
C．Traditional ways of losing weight are better than operation.
D．Overweight people will get smarter by taking more exercise.
【小題4】Which of the following is the best title for th e text?
A．Body Weight and Health
B．Losing Weight by Operation
C．Ways to Improve Mental Functions
D．Losing Weight to S harpen Your MindD

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

All people need to sleep. Sleep is a necessary process that promotes proper body functioning and can improve the quality of your life. Not only is the quantity of sleep important, but also the quality of sleep.
Your bedroom should be shaped to your taste and allow you to sleep in a peaceful environment. One of the biggest mistakes people make in their sleep is to use their bedroom for activities other than sleep. If your bedroom also functions as a command station for your life and work, the likelihood of your sleeping being poor is rather high. Bedrooms should be designed, decorated and used for sleep mainly. TVs, computers and other things should not be in your bedroom if at all possible.
Establishing regular sleeping and waking times can help improve the quality of your sleep especially for those suffering from sleeplessness. Avoid hot food, caffeine, sugar and alcohol at least 4 to 6 hours before your sleep time. Develop a regular exercise program. Proper exercise and nutrition will help improve sleeping patterns. However, avoid exercising 2 hours before sleeping, since this may stimulate your body and make sleeping more difficult.
Establish a pre-bedtime rule that will help you focus on sleep. You can try deep thought，reading or deep breathing and relaxation. Your bedtime rule should be yours. Do not worry about it fitting into a specific category. Do what is best for you.
Things such as room temperature, noise and light levels and even your bed mattress(床墊) can have a lot of effect on the quality of sleep that you experience. Block out distracting noises and lights. You are in your bedroom to sleep and not be distracted by environmental interferences.
【小題1】Which of the following is the best title for the text?

A．How to Deal with Sleep Problems
B．What is the Process of Sleep
C．Where Should We Sleep
D．How to improve Sleep Quality
【小題2】According to the author,       
A．The bedroom has many functions than expected
B．Computers can make people sleep fast
C．The bedroom is better used only for sleep
D．Amusements are forbidden in the bedroom by law.
【小題3】If you have sleep problems,    
A．A well-decorated bedroom is important to you
B．You’d better have steady sleeping and waking time
C．Cold food and sugar are good for you
D．You need proper exercise just before sleep
【小題4】The main idea of the last paragraph is           
A．a(chǎn) good sleep environment contributes to good sleep
B．blinding lights can make for a good sleep
C．bed mattress plays a key part in sleep
D．distracted people are sleepless

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

In the Caucasus region of Russia, nearly 50 out of every 100,000 people live to celebrate their 100th birthday, and many don’t stop at 100! By comparison, in America only 3 people in 100,000 reach 100. But these Russian old people aren’t alone. The Pakistanis, who live high in the Himalaya Mountains, and the Ecuadorans of the Andes Mountains seem to share the secret of long life, too.
These people remain healthy in body and spirit despite the passage of time. While many older persons in industrial societies become weak and ill in their 60s and 70s, some Caucasians aged 100 to 140, work in the fields beside their great-great-grandchildren. Even the idea of aging is foreign to them. When asked “at what age does youth end?”most of these old people had no answer. Several replied, “Well, perhaps at age 80.”
What accounts for this ability to survive to such old age, and to survive so well？First of all, hard physical work is a way of life for all of these long-lived people. They begin their long days of physical labor as children and never seem to stop. For example, Mr . Rustam Mamedov is 142 years of age. His wife is 116 years old. They have been married for 90 years. Mr. Mamedov has no intention of retiring from his life as a farmer. “Why？What else would I do？”he asks. All these people get healthful rewards from the environment in which they work. They all come from mountainous regions. They live and work at elevations of 1,660 to 1,000 meters above sea level. The air has less oxygen and is pollution-free. This reduced-oxygen environment makes the heart and blood vessel(血管) system stronger.
Another factor that may contribute to the good health of these people is their isolation. To a great extent, they are separated from the pressures and worries of industrial society. Inherited factors also play some role. Most of the longest-lived people had parents and grandparents who also reached very old ages. Good family genes may, therefore, be one factor in living longer.
【小題1】The example of Mr. and Mrs. Mamedov implies that some Caucasians aged 100 to 140 ____.

A．become weak and hopeless
B．a(chǎn)re too old to work in the fields
C．benefit from physical work
D．a(chǎn)re still working in the fields
【小題2】What is the main way of life for all of these long-lived people?
A．Retiring from their lives as farmers.
B．Having been married for 90 years.
C．Hard physical work.
D．Having no intentions.
【小題3】Which of the following factors isn’t helpful to people’s health and long life?
A．Clean mountain air.
B．Daily hard work.
C．Good genes
D．Stress and pressure.

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

The triathlon(鐵人三項(xiàng)運(yùn)動(dòng)) promises to be one of the most popular Olympic sports.Recently it has drawn huge crowds attracted by athletes swimming 1,500m，cycling 40km，then running 10km without stopping.But what makes an attractive 17­year­old girl give up everything for the doubtful pleasure it offers?
Melanie Sears has not yet learnt those often­repeated phrases about personal satisfaction，mental challenge and higher targets that most athletes use when asked similar questions.“You swim for 1,500m，then run out of the water and jump on your bike，still wet.Of course，then you freeze.When the 40km cycle ride is over，you have to run 10km，which is a long way when you’re feeling exhausted.But it’s great fun，and all worth it in the end，” she says.
Melanie entered her first triathlon at 14 and she won the junior section.Full of confidence，she entered the National Championships，and although she had the second fastest swim and the fastest run，she came nowhere.“I was following this man and suddenly we came to the sea.We realised then that we had gone wrong.I ended up cycling 20 kilometres too far.I cried all the way through the running.”
But she did not give up and was determined that she never will.“Sometimes I wish I could stop，because then the pain would be over，but I am afraid that if I let myself stop just once，I would be tempted(誘惑) to do it again.”Such doggedness draws admiration from Steve Trew，the sport’s director of coaching.“I’ve just been testing her fitness，” he says, “and she worked so hard on the running machine that it finally threw her off and into a wall.She had given it everything，and she just kept on.”
Melanie was top junior in this year’s European Triathlon Championships，finishing 13th.“I was almost as good as the top three in swimming and running，but much slower in cycling.That’s why I’m working very hard at it.” She is trying to talk her long­suffering parents，who will carry the ￡1,300 cost of her trip to New Zealand for this year’s world championships，into buying a ￡2,000 bike，so she can try 25km and 100km races later this year.
But there is another price to pay.“I don’t have a social life，”she says.“After two hours’ hard swimming on Friday night，I just want to go to sleep.But I phone and write to the other girls in the team.” What does she talk about？Boys？Clothes？“No，what sort of times they are achieving.”
【小題1】How does Melanie differ from other athletes，according to the writer?

A．She worries less than they do.
B．She expresses herself differently.
C．Her family background is not like theirs.
D．Her aims are different from theirs.
【小題2】What upset Melanie during the National Championships?
A．She was tricked by another competitor.
B．She felt she had let her team­mates down.
C．She made a mistake during part of the race.
D．She realized she couldn’t cycle as fast as she thought.
【小題3】What is Melanie trying to persuade her parents to do?
A．Buy an expensive bike for her.
B．Give her half the cost of a bike.
C．Let her compete in longer races.
D．Pay for her to go to New Zealand.
【小題4】What does Melanie say about her relationships with her team­mates?
A．She would like to see them more often.
B．She only discusses the triathlon with them.
C．She thinks they find her way of life strange.
D．She dislikes discussing boys or clothes with them.

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Europe’s deadly outbreak of a rare form of E. coli bacteria (大腸桿菌) has brought new attention to food safety issues. One of the problems when people get sick from food is that the simplest question is often difficult or even impossible to answer. Just what did the people eat that made them sick?
Of course, one way to avoid these medical mysteries is to keep dangerous organisms out of the food supply. This is easier said than done, but scientists keep looking for new ways.
Scientists in the United States have developed an experimental system that uses a high-tech optical scanner. The system is designed to identify the presence of contaminants(致污物) like soil or animal waste on fresh produce. These can be sources of E. coli. E. coli bacteria naturally live in the intestines(腸) of humans and many animals. Most kinds of E. coli are harmless but some can make people sick.
The new scanner can also show damage and imperfections that might make the produce unappealing to shoppers.
Scientists designed the system at a Department of Agriculture research center in Beltsville, Maryland. Moon Kim of the Agricultural Research Service led the team.
MOON KIM: “We were requested, we were asked, to develop a method to detect contamination in produce. So we started with the apple as the model sample.”
The scanner uses a high-speed camera placed over the conveyer belt that moves the produce along. As the apples move along the belt, the scanner captures images of each piece of fruit.
Moon Kim says the team hopes the system will be available before long.
MOON KIM: “We are targeting for development in commercial plants for the next several years.”
The scanner can direct a sorting machine to separate the bad apples from the good ones. The system is currently able to show the surface of only half the apple as it speeds by. The inventers hope to improve the process so it can show the whole surface.
【小題1】What is the main topic of the text?

A．Bacteria. B．A high-tech scanner.
C．A camera D．Food safety.
【小題2】E. coli bacteria ______.
A．broke out all over the world B．comes from soil or animal waste
C．is extremely harmful to health D．does not cause illness
【小題3】The high-tech scanner ______.
A．can help to sort out different fruits
B．make the produce appeal to shoppers
C．can only capture images of the whole apple
D．can identify the presence of contaminants
【小題4】What can be inferred from the text?
A．The scanner needs to be improved.
B．The scanner will be available in the next several years.
C．Moon Kim is unwilling to develop the scanner.
D．The scanner is connected to a sorting machine.

查看答案和解析>>

同步練習(xí)冊(cè)答案