Nature is full of color, from rainbows and roses to butterfly wings and peacock tails. Even the fruits and vegetables you eat have different colors: blue blueberries, red strawberries, green broccoli, and orange carrots.
Plant and animals often use color to attract attention. The substances responsible for these colors belong to a class of chemical called antioxidants(抗氧化物). Plants make antioxidant to protect themselves from the sun’s ultraviolet(UV)(紫外线)light.
Ultraviolet light causes chemicals called free radicals(自由基)to form within plant cells. They can destroy parts of plant. Free radicals also have damaging effects on human beings. Some of these effects like wrinkled skin can be seen. The damage is caused by the free radicals attacking cells in our bodies. Certain cancers and heart disease are linked to free radicals.
Our bodies have natural defences for fighting off free radicals. While we are young, our defences are pretty strong. However, they get weaker as we get older. The body’s built-in defences can only go so far without extra help.
The key to fighting free radicals with fruits and vegetables is to mix and match colors. It’s like sunscreen(防晒霜)for the inside of your body. Go for a range of very bright colors. Colorful foods contain hundreds of healthy chemicals not found anywhere else.
Research into how chemicals in blueberries affect the brain’s function in rats suggests that these chemicals may help our own brains work more efficiently.
Don’t just blame the sun. Ultraviolet light isn’t the only source of free radicals. If you breathe polluted air such as smog, automobile exhaust(废气), or wasted gas from a factory, you take in chemicals that also cause such damage. And, the body itself produces free radicals as it processes food.Which of the following not true?
| A．Antioxidants are responsible for plant colors |
| B．Plants use color to attract attention |
| C．Antioxidants can protect plants from UV light |
| D．Antioxidants help free radicals to attack plants |
In which order do the following facts occur?
a Wrinkled skin can be seen
b UV light causes free radicals to form
c Free radicals damage cells in our bodies
d The sun gives out UV light
| A．a,b,c,d | B．d,b,c,a |
| C．c,a,d,b | D．d,b,a,c |
We need extra help for fighting off free radicals from fruits and vegetables because ____.
| A．our bodies’ defences are not natural |
| B．we are too young to defend ourselves |
| C．our defences get weaker as we get older |
| D．our bodies’ built-in defences can only go away |
Which of the following can not cause free radicals to form?
| A．Colorful food | B．UV light from the sun |
| C．Polluted air | D．The body itself |
Sweetest Day in America is always the third Saturday in October. This holiday is much more important in some regions than in others (Detroit, Cleveland and Buffalo being the biggest Sweetest Day cities). It is a holiday that is gaining in popularity every year throughout the country.
Sweetest Day is celebrated on the third Saturday in October as a day to make someone happy. It is an occasion which offers all of us an opportunity to remember not only the sick, aged, and orphaned, but also friends, relatives and associates whose helpfulness and kindness we have enjoyed.
Over 60 years ago, a man in Cleveland, believing that the city's orphans and shutins (卧病在床的人) too often felt forgotten and neglected, thought of the idea of showing them that they were remembered. He did this through the distribution of small gifts. With the help of his friends and neighbors, he distributed these small remembrances on a Saturday in October. During the years that followed, other Clevelanders began to participate in the celebration ceremony, which came to be called “Sweetest Day”. In time, the Sweetest Day idea of spreading cheer to the underprivileged was broadened to include everyone, and became an occasion for remembering others with a kind act or a small remembrance. And soon the idea spread to other cities all over the country.
Sweetest Day is not based on any single group's religious affection or on a family relationship. It is a reminder that a thoughtful word or deed enriches life and gives it meaning.
Because for many people remembering takes the form of giftgiving, Sweetest Day offers us the opportunity to show others that we care, in a practical way. We can learn from the first paragraph that Sweetest Day is ________.
| A．sometimes the third Saturday in October |
| B．hardly celebrated in Detroit |
| C．of equal importance in every part of the USA |
| D．getting increasingly popular in the USA |
Sweetest Day was intended to remember ________.
| A．the young and disabled |
| B．friends and relatives |
| C．orphans and shutins |
| D．the sick and aged |
We can infer from the passage that the birthplace of Sweetest Day is ________.
| A．Detroit | B．Cleveland |
| C．Buffalo | D．Washington |
Now on Sweetest Day gifts are given to those ________.
| A．we care | B．we admire |
| C．in need of help | D．in trouble |
To Friend or Not to Friend
We all love our parents and turn to them when we're in need, but would you like them to hear the conversations you have with your friends on the school playground or lunch queue? Social networking sites have become extensions of the school hallways, so would you add your parents as “friends” and allow them to view your online activities and conversations with friends?
In the past the generation gap included a technology gap, where children were up to date with latest technology and parents were left behind, content to continue their day to day lives as they always had because they had no need to know more about technology. However, more and more parents are beginning to realize just how important social networks are in their lives. This realization has given many parents the motivation to educate themselves about social networking sites.
These days many people are attracted to social networking sites because they can choose who they have around them; there's also a certain amount of control over privacy that we don't get in real life. Sometimes we feel that privacy is violated when we must accept a “friend” request from a parent or family member.
It's a difficult choice whether or not to allow a parent to become a part of our online lives. On the one hand we don't want to “reject” their request because that might hurt their feelings or make them feel you have something to hide. On the other hand if you do accept, then you could have a sense of being watched and no longer feel free to comment or communicate the way you did before.
A recent survey suggested that parents shouldn't take it personally if their child ignores their request: “When a teen ignores a parent's friend request, it doesn't necessarily mean that they are hiding something, but it could mean that this is one part of their life where they want to be independent.”
Perhaps talking with parents and giving explanations would help soften the blow if you do choose not to add them to your friends list. From Paragraph 2, we learn that ________.
| A．parents feel secure about their privacy online |
| B．social networks successfully fill the generation gap |
| C．parents have realized the importance of social networks |
| D．social networks offer a platform for parents to communicate |
Teenagers may refuse a parent's friend request because ________.
| A．they hide something from their parents |
| B．they are unwilling to be watched by parents |
| C．their parents tend to fall behind in technology |
| D．their parents make negative comments on them |
The passage is mainly about ________.
| A．privacy online |
| B．social networks |
| C．the generation gap |
| D．parents' friend requests |
The passage is written mainly for ________.
| A．parents | B．teenagers |
| C．teachers | D．researchers |
Steve knew he'd been adopted as a baby, and when he turned 18, in 2003, he decided he'd try to track down his birth mother. The agency from which he'd been adopted gave him his mother's name: Tallady. But online searches didn't turn up any results about it, and Steve had to let it go.
In 2007, though, he searched for the name again online. This time, the search results included a home address near the Lowe's store where Steve, then 22, worked as a deliveryman. When he mentioned the coincidence to his boss, his boss said, “You mean Tallady, who works here？”
Steve and Tallady, a cashier, had said hello to each other a few times at the store, but they'd never really talked. He hadn't even known her name. Steve thought there was no possible way she was his mother though they shared the same name. For a few months, Steve avoided Tallady. “I wasn't sure how to approach her，” he told a local reporter. Finally, the agency volunteered to arrange their reunion.
When Tallady realized that the nice guy she'd been waving at was his son, she sobbed. She'd always hoped to meet her birth son one day. Later that day, mother and son talked for almost three hours at a nearby bar. She'd given him up for adoption in 1985, when she was 23. “I wasn't ready to be a mother，” she told him. Married with two other children, Tallady says, “I have a complete family now.”Steve gave up the online search for his birth mother in 2003 because ________.
| A．the agency didn't give him any help |
| B．there was no information about his mother |
| C．his mother didn't turn up online |
| D．he missed the information about his mother |
．What did Steve find about his mother online in 2007?
| A．Her home address. | B．Her full name. |
| C．Her boss's name. | D．Her new job. |
Why Steve avoided Tallady for months?
| A．Because she didn't want to talk to him. |
| B．Because he wasn't fully prepared for the reunion. |
| C．Because she was very difficult to approach. |
| D．Because he didn't think she was his birth mother. |
The best title for the text is ________.
| A．The Love of Mother |
| B．An Unexpected Meeting |
| C．The Power of the Internet |
| D．An Unusual Reunion |
On May 23rd the United States Department of Agriculture will meet to discuss the pressing topic of wild pigs. These beasts, which number 6 million or so, are an increasing bother. At their worst, they can damage crops, spread diseases, attack humans and kill farm animals. And things are getting worse: a study show that they are likely to double in number over the next 3 years. Why is it so hard to control wild pigs?
Introduced to America in the 16th century, and related to the wild pigs found in Europe, wild pigs can be found in 75% of all states. No single law exists to control them and regulations differ between states: while in Missouri they can only be shot if met by chance, in Texas hunting is actively encouraged. A “pork chopper” law allows Texan hunters to shoot wild pigs from helicopters, and some people in Louisiana have even built their own pighunting drone(无人机). As well as being popular with hunters, wild pigs are cheaper for game raisers to breed(饲养)than deer. In Michigan and Pennsylvania suggested bans on the private breeding of pigs for hunting have caused quarrels between game raisers and wildlife officials.
Wild pigs' double nature——considered pests by farmers, but valued by hunters——makes it hard to pass laws to control them. Two other factors also contribute. Nearly 70% of land in America is privately owned. And it is difficult for lawmakers to impose(强加)breeding and hunting laws on private landowners. Secondly, it is hard to define a wild pig.
In some states, laws are being introduced to redefine the term “wild animal” to keep out wild pigs. This is good news for those raising pigs for hunting, but less are to those who consider them pests whose number should be limited. Meanwhile, discussions continue over how to deal with this problem.People are not permitted to hunt wild pigs freely in ________.
| A．Texas | B．Michigan |
| C．Missouri | D．Louisiana |
Why do the game raisers prefer raising wild pigs to deer?
| A．It's difficult to raise deer. |
| B．Wild pigs are in large numbers. |
| C．Deer are not popular with hunters. |
| D．They can benefit more from wild pigs. |
Which is NOT the reason for the difficulty in controlling wild pigs?
| A．The difficulty of passing effective laws. |
| B．The high percentage of land owned privately. |
| C．The farmers' unwillingness to shoot wild pigs. |
| D．The popularity of raising wild pigs in many states. |
What is the best title of the text?
| A．Why are wild pigs so hard to control? |
| B．Are wild pigs pests or wild animals? |
| C．Wild pigs——an increasing danger in the US. |
| D．How to deal with the problem of wild pigs? |
As we enjoy the summer ocean waves along the beaches, we may think nervously about Steven Spielberg's Jaws and the great fear that sharks inspire in us. Yet we are happy to see global efforts to protect the declining number of sharks. The world has realized that we need the species, like sharks, to keep a balanced ecosystem.
Sharks, in particular, are “in” these days. Thanks to good public policy and famous stars such as Jackie Chan and Ang Lee, killing sharks for fin soup is no longer cool.
The demand for shark fins has been rising for decades, threatening sharks with extinction(灭绝)—up to 100 million sharks are killed each year just for their fins. But we have started to reverse the trend, particularly in many areas of the United States and overseas where restaurants once proudly provided delicious shark fins on the menu.
In California, a ban on the sale and possession of shark fin soup has gone into effect this year through the efforts of Wild Aid and other organizations.
Overseas marketing and public efforts featuring posters on public transportation systems and TV ads have been underway for the past few years. These efforts all show signs of success, on both the supply side and the demand side of trade in shark fins.
Actually, stopping the killing of sharks is part of a broader movement to stop the killing of wild animals and the buying and selling of wildlife products. These products come from hunting elephants, tigers and rhinos, besides killing marine life.
Whether it is shark fin soup or ivory piano keys, killing animals is big business. The hunting of elephants in search of ivory tusks for luxury(奢侈的)goods has become a fullscale war. The decrease of African elephant populations is alarming. Together with international partners, the United States is leading the worldwide effort to reduce demand for highend products that rely on killing animals. The underlined word “reverse” in Paragraph 3 probably means ________.
| A．show | B．keep |
| C．follow | D．change |
From the passage, we know ________.
| A．Jackie Chan and Ang Lee make fin soup popular |
| B．a lot of wild animals have been killed for products |
| C．Steven Spielberg's Jaws inspires us to protect sharks |
| D．the number of African elephants has been increased |
．What can we infer from the passage?
| A．More animals for highend products will be saved. |
| B．People have kicked the habit of having shark fin soup. |
| C．Shark fins will not be available any more in restaurants. |
| D．Global efforts have succeeded in stopping killing wild animals. |