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The other day，I bought an expensive anti-aging cream that promised to make my face look several years younger that other women by fighting free radicals.It made me curious about what free radicals are.Is the anti-aging cream the only ways I need to protect myself？
   "As a scientific term，free radicals are essentially unstable atoms，" says Arizona-based doctor，Natasha Bhuyan.M.D."In medicine，they cause cells to break down over time and are linked to aging."
   A super simple chemistry review for you：Atoms from different elements are the building blocks that make up water，nitrogen and more.Electrons（電子） are the negatively charged atoms，and they like to be in pairs.When an electron loses its partner，it creates a free radical，which is usually unstable and highly reactive.Free radicals typically go through the body to seek out a replacement for their missing electron，and that can result in damage to cells，proteins and DNA.
   So how do free radicals form and why do they happen？Bhuyan says，"Scientifically，free radicals are unpaired electrons that are seeking a mate to bond with.The theory behind free radicals is that they can lead to the imbalance between free radicals and antioxidants（抗氧化劑）." Another mini-science lesson for you：Antioxidants are natural or man made matters that can help delay or prevent some types of cell damage.They're often found in fruits and vegetables.
   A lot of the aspects of modern life-our diet，lifestyle and environmental factors like pollution，can cause oxidative stress.Over time，oxidative stress weakens cell and tissues and can leave you more easily to certain health issues including cancer.And，as beauty marketers are keenly aware，oxidative stress can also speed up the aging process.Now that your know free radicals can weak on your health，you re probably wondering if there are any ways to prevent them from forming or at least to minimize their negative effects.

（1）What does the author intend to do in paragraph 1？
B
B

A．Explain the process of aging.
B．State' the formation of free radicals.
C．Describe the harm of anti aging cream.
D．Introduce the topic of free radicals.
（2）Which of the following do free radicals refer to？
B
B

A．Steady atoms.
B．Unpaired electrons.
C．Replacements of atoms.
D．Functions of electrons.
（3）What can we learn about antioxidants from the text？
D
D

A．They can slow down the damage of some cells.
B．They do harm to cells，proteins and DNA.
C．They have never been found in nature.
D．They always keep balance with free radical.
（4）What will the author probably tell us next？
D
D

A．What exactly oxidative stress is.
B．How beauty marketers promote sales.
C．Whether free radicals can be prevented.
D．Where a variety of diseases come from.

【考點(diǎn)】說明文．

【答案】B；B；D；D

【解答】

【點(diǎn)評(píng)】

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發(fā)布：2024/5/27 14:0:0組卷：4引用：1難度：0.5

相似題

1．Animals are natural resources that people have wasted all through our history.
   Animals have been killed for their fur and feathers，for food，for sport，and simply because they were in the way.Thousands of kinds of animals have disappeared from the earth forever.Hundreds more are on the danger list today.About 170 kinds in the United States alone are considered in danger.
   Why should people care？Because we need animals.And because once they are gone，there will never be any more.
   Animals are more than beautiful or interesting or a source of food.Every animal has its place in the balance of nature.Destroying one kind of animal can create many problems.
   For example，when farmers killed large numbers of hawks（鷹），the farmers' stores of corn and grain were destroyed by mice.Why？Because hawks eat mice．With no hawks to keep down their numbers，the mice multiplied quickly.
   Luckily，some people are working to help save the animals.Some groups raise money to let people know about the problem.And they try to get the governments to pass laws protecting animals in danger.
   Quite a few countries have passed laws.These laws forbid the killing of any animal or plant on the danger list.Slowly，the number of some animals in danger is growing.

（1）What is the best title for the passage？

A．Save the Animals
B．Useful Animals
C．Laws for Animals
D．Animals in Danger
（2）Animals are important to us mainly because

.
A．they give us a source of food
B．they are beautiful and lovely
C．they keep the balance of nature
D．they give us a lot of pleasure
（3）What is the meaning of the underlined word "multiplied" in the passage？

A．Became more.
B．Became less.
C．Turned black.
D．Ate food.
（4）We can infer from the passage that

.
A．people have known the importance of animal protection since a long time ago
B．a(chǎn)nimals play an important role in people's life
C．the number of hawks is on the decrease
D．many countries passed laws forbidding the killing of any animal
發(fā)布：2024/11/15 4:0:1組卷：10引用：2難度：0.5
解析
2．If you are a teenager without a job，you probably do not have much extra money.Sometimes parents will give their children a weekly pocket money for doing small housework，but it is often not enough once the children grow into teenagers and want to do things with their friends all of the time.How to make money is an important thing for teens to learn.If you're wondering how a teenager can make good money，some ideas might be：
   Getting a part-time job at a local restaurant or store is always a sure way to make money as a teen.But getting a job somewhere like this might be hard，considering many jobs in local stores are being taken by adults more and more often.Babysitting is always a good way to make money as a teenager，and finding jobs as a babysitter is often easier than finding a job in a store.
   Doing landscaping（綠化） is something that most adults do not like to do，and teens can usually find jobs around their neighborhood doing the landscaping of friends and family.
   Some teens are good at something such as writing or photography.These teens can make money by doing things such as writing articles for newspapers or magazines or selling their photos online.
   Teens who live in a country area can earn money by helping out on farms，or they can try raising their own animals such as chickens，and selling them or their products.
   Looking for jobs can seem hard at first，but if you have a try，it should not be too hard to find a job or way to make money.

（1）What problem do teenagers have to face when finding a job in local stores？

A．Low pay.
B．Heavy work
C．Long working hours.
D．Competition with grown-ups.
（2）Which of the following is easier for teens who live in a country if they want to earn extra money？

A．Babysitting.
B．Doing landscaping.
C．Selling photos online.
D．Raising animals.
（3）What can we learn from the text？

A．Most grown-ups hate doing landscaping.
B．Getting a part-time job is hard for teens.
C．Pocket money from parents is often enough for teens.
D．Looking after babies is easier than serving customers in a restaurant.
（4）What can be the best title for the text？

A．The Necessary Skills to Make Money
B．How Important Is Money to a Teenager？
C．How Can a Teenager Make Extra Money？
D．Teenagers Should Depend on Themselves
發(fā)布：2024/11/15 8:30:3組卷：0引用：1難度：0.5
解析

3．Why Experiencing a New Culture Is Good for You Often the best way to really explore a new place and culture is by spending abundant time there.A quick vacation may give you a glimpse（警） into your destination. （1）

.These opportunities provide a support network as you adjust to new surroundings.
   Dealing with culture shock
   Culture shock is a response to your new surroundings when abroad that can leave you confused，anxious and feeling lonely.It generally includes frustration at how even the simplest things can be different in the new culture.The thing is though，culture shock can be seen as a problem but also as an opportunity. （2）

.
   （3）

   Perhaps the most obvious lesson learned with travel is the importance of language.Even just learning the basics of the local language can make getting about and making new friends easier.Trying to overcome the language barrier also teaches you about non-verbal communication.Since you can't rely on what is being said，you learn to adapt，to people's tone and body language.This makes you a better communicator.
   Finding inspiration
   （4）

.In each of these creative fields you may come across new approaches or elements that you bring home with you；maybe it's a certain combination of ingredients that you add to your cooking or a new style you adopt for your own home's design.
   Meeting new people
   Meeting people and making friends while overseas is both a necessity and one of the most enjoyable aspects of the experience. （5）

，which enables you to meet people that you never would have known otherwise.You may be exposed to people from different walks of life，find a similar spirit，or both at the same time.

A．Learning language skills
B．Developing body language
C．So you're less likely to further experience a new culture
D．Travelling to new cultures is a great way to expand your social circle
E．Experiencing the local culture can expose you to local art，cuisine，architecture，etc.
F．Only by adjusting to and accepting new surroundings can you understand and appreciate it
G．But experiences like student or work exchange programs allow you to immerse（沉浸） in a new culture

發(fā)布：2024/11/15 5:0:1組卷：5引用：3難度：0.5

解析

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