【推荐1】The Internet plays a big part in human life. We use it for work and pleasure. We use it to learn a new language. We find advice on it. We use it to connect with family and friends. We use it to stay in touch with events we care about. The list goes on and on.

Well, that train has left the station.   This expression means there is no going back to an Internet-free life. But can using the Internet too much be bad for our health? It might be, researchers say. A new study finds that heavy Internet use may be connected to high blood pressure in an unlikely group: teenagers.

High blood pressure makes your heart and blood vessels work too hard. Over time, this extra pressure increases your risk of a heart attack. High blood pressure can also cause heart and kidney disease. It is also closely linked to a brain disease.

The Henry Ford Hospital in Detroit, Michigan did the study. 335 young people, from 14 to 17 years old , took part in it. 134 of the teens were described as “heavy Internet users.” And researchers found that out of these 134 teens,26 had high blood pressure. The researchers say the study is the first to connect heavy web use with high blood pressure. Other research has connected heavy Internet use with anxiety, depression and obesity.

The lead researcher is Andrea Cassidy Bushrow. She said, “Using the Internet is part of our daily life, but it shouldn’t ruin us.” Ms. Cassidy Bushrow adds that it is important for teens to take regular breaks from their computers or smartphones and do some kind of physical activity. She also suggests that parents limit their children’s use of the Internet to two hours a day, five days a week.

1. The expression “that train has left the station” in Para. 2 is used to show________.

A．the Internet develops rapidly	B．no one can escape from the Internet
C．the Internet can provide whatever we want	D．there is no going back to an Internet free life

2. What is Para. 3 mainly about?

A．Causes of high blood pressure.	B．The harm of high blood pressure.
C．The disadvantages of Internet use.	D．Ways to prevent high blood pressure.

3. Andrea Cassidy Bushrow would agree that________.

A．teenagers shouldn’t use the Internet

B．the Internet will ruin human life in the future

C．smartphones are more harmful than computers

D．regular breaks are necessary when using the Internet

4. What can be used as the best title of the passage?

A．Heavy Internet users are mostly teenagers	B．How to prevent teenagers from the Internet
C．Too much Internet use may be bad for teenagers	D．Every coin has two sides—so does the Internet

【推荐2】Before she leaves home in San Francisco, California, Jennifer Schaefer, puts on long sleeves and a big hat she calls her “personal umbrella.” With her fair skin, red hair, memories of bad childhood sunburn, and a family history of skin cancer, Schaefer is painfully aware of the danger of exposure to ultraviolet(紫外线) radiation, which accounts for the vast majority of skin cancers.

So she finds it unbelievable how few people bother with sun safety, with most preferring sun worship to sun protection. “In our culture, it’s almost funny to be too protected,” she says, highlighting the way her friends tease her when she puts on her bathing suit-a protective 'rash guard' top and knee-length board shorts.＂We're slowly starting to become aware of the long-term effects of the sun, but it's like global warming-people are not going to make serious changes until they feel a direct impact."

That impact has helped push Australians, who are famous for sun loving, into changing their behavior. With its high solar ultraviolet levels and mostly fair-skinned population, Australia has the highest rate of skin cancer in the world. But after decades of increase, the melanoma(黑色瘤) rate began to stay at a steady level in the mid-1990s.The incidence of melanoma among young people's is now falling, as national surveys show that most Australians-more than 70% of adults and 55%of adolescents-no longer prefer a tan(棕褐色).

A 2013 study shows that, in addition to Australis, a handful of countries-notably New Zealand, Canada, Israel, Norway, the Czech Republic(for women)and the United States(for white men)-have melanoma rates that are declining or stabilizing among young people.

Back in San Francisco, Jennifer Schaefer is doing her best to educate the next generation. Her eldest daughter automatically puts on a hat to go outside. “Habits really start in children-it is like brushing your teeth,” she says.

1. By describing Schaefer's bathing suit, the author suggests that Schaefer_____.

A．does not mind the teasing by her friends

B．attaches great importance to sun protection

C．goes to extreme measures to avoid the sun

D．is more interested in surfing than sunbathing

2. What do New Zealand and Canada have in common?

A．Sun protection programs are developing quickly.

B．Their citizens prefer to be pale rather than get tanned.

C．Skin cancer rates are not increasing among the young.

D．Women and white men have the lowest rates of melanoma.

3. What function does the final sentence have?

A．It makes the conclusion more meaningful.

B．It makes a complex concept easier to understand.

C．A serious topic is made more cheerful and attractive.

D．A familiar example supports the point made by the author.

4. What's the purpose of the text?

A．To help individuals know how to make medical decisions.

B．To call for more research into ultraviolet radiation effect.

C．To draw the public's attention to ultraviolet radiation effect.

D．To honor a mother for her research into ultraviolet radiation.

【推荐2】People in the United States honor their parents with two special days：Mother‘s Day，on the second Sunday in May，and Father’s Day，on the third Sunday in June.These days are set aside to show love and respect for parents.They raise their children and educate them to be responsible citizens.They give love and care.These two days offer an opportunity to think about the changing roles of mothers and fathers.More mothers now work outside the home.More fathers must help with child care.
These two special days are celebrated in many different ways. On Mother’s Day people wear carnations（康乃馨）.A red one symbolizes a living mother. A white one shows that the mother is dead. Many people attend religious services to honor parents. It is also a day when people whose parents are dead visit the cemetery. On these days families get together at home，as well as in restaurants. They often have outdoor barbecues for Father’s Day. These are days of fun and good feelings and memories.
Another tradition is to give cards and gifts. Children make them in school. Many people make their own presents.These are valued more than the ones bought in stores. It is not the value of the gift that is important，but it is “the thought that counts.”Greeting card stores，florists，candy makers，bakeries，telephone companies，and other stores do a lot of business during these holidays.
1. Which is NOT a reason for children to show love and respect for parents？

A．Parents bring up children

B．Parents give love and care to children

C．Parents educate children to be good persons

D．Parents pass away before children grow up

2. What do you know from the passage？

A．Mother’s Day and Father’s Day are both in May.

B．Fewer women worked outside the home in the past.

C．Not all the children respect their parents.

D．Fathers are not as important as mothers at home.

3. On Mother’s Day and Father’s Day，____ .

A．people usually have family parties

B．everyone goes to visit the cemetery

C．children always go to parents’home

D．hand-made cards are the most valuable gifts

4. What do you think “florists”do？

A．They sell flowers.

B．They make bread or pastry.

C．They offer enough room for having family parties.

D．They sell special clothes for Mother‘s Day and Father’s Day.

【推荐3】Many research groups are testing “ink” made from silk proteins to print human tissues, even organs. The process is a less costly alternative to conventional 3-D printing with collagen, a key protein mainly existing in the mammal’s (哺乳动物) cells. Researchers in Assam, a state in India, are investigating using local silkworm species for the task—they recently submitted a patent for bioinks using a combination of proteins obtained from local silkworms. The scientists have woven them into tissue structures ranging from ears to heart.

Silk is a natural substance which is strong and completely biodegradable (可生物降解的), well suited for applications in tissue engineering. For instance, to bio-print an ear, researchers dissolve silk fibers. They carefully mix the sticky liquid with a patient’s stem cells, then build structures layer by layer with a 3-D printer. Finally, the cells grow and replace the silken proteins and finally change into a natural substance in human body.

Compared with common—used chemicals as adhesive (黏合剂), wild silk is also perfect to cross-link silky tissues, which helps to maintain a 3-D structure. Also, the wild silk has spots that cells naturally attach to, which allows cells to stick to the silk structure rapidly. “These silks are ideal candidates for bioinks because they can be combined to build strong human tissues” says Mandal, the lab’s lead investigator. “This is important, for example, when making bones,” he add.

“Obtaining and purifying collagen from animal remains is complex and expensive.” says David Kaplan, an expert in biomedical engineering, when asked about the advantages. Compared with collagen, silks have an immense advantage in terms of supply and processing. Local sourcing is also a clear plus in their use in India.”

Mandal and his colleagues have already created original structures, including bone and soft tissues of the heart and liver. Reconstructing a human knee complex tissue at the ends of a bone will be next.

1. What does the underlined word “bioinks” refer to?

A．Silk proteins.	B．Collagens.
C．Certain chemical.	D．Tissues.

2. What will a patient eventually get after an ear-bioprinting?

A．An artificial ear.	B．A silken ear.
C．A real ear.	D．An original ear.

3. What are the advantages of silk proteins over collagen according to David Kaplan?

A．They are biodegradable and strong.

B．They are inexpensive and uncomplicated.

C．They are harmless and attachable.

D．They are pure and available.

4. What is the best title for the text?

A．Final Solution—Wild Worms for Medical Treatment.

B．Silky Tissue—Worm Proteins Ready for 3-D Bioprinting.

C．Bioink—Cheap Alternative for Conventional Operations.

D．Protein—Key to Repairing Human Organs.