Gray hair is simply a part of the normal aging process, and the rate you go silver is genetically predetermined. Going gray is not associated with earlier death, and premature graying is not, generally speaking, a sign of an illness or ill health in younger adults. There are, however, some specific health conditions associated with gray or white hair, but for most of us, going gray is just a fact of life.
Hair color comes from the pigment melanin(黑色素), which determines your individual shade. Hair without any melanin is pure white. The pigment is produced in cells called melanocytes, which inject pigment into the hair. At some point in everyone's lifetime, these cells slow down and eventually stop producing color. Scientists have yet to identify the exact mechanism by which melanocyte cell death occurs.
A study of more than 4,000 women and men from 20 countries determined that about 75% of people between the ages of 45 and 65 have some gray hair. In general, people of European descent gray earliest followed by Asians and Africans. It's interesting to note that a lucky 1 in 10 has no gray hair by retirement age. Beginning at age 30, your chances of having gray hair go up 10-20% per decade.
It may feel like you have more grays after a stressful event, but that's probably because middle age is basically a series of anxiety-ridden events. Between working, raising kids, and caring for older parents, the "sandwich" years of 45-65 can be stressful, especially for women. They are also when we naturally start to look older.
At this point, there is still no silver bullet to keep away the grays.
1.What would be the best title for this passage?
A. Going gray. B. Tips to make hair color last
C. Why does hair turn gray? D. Gray hair is in fashion.
2.Which of the following is a true statement according to the passage?
A. Scientists have found out how to prevent hair from turning gray.
B. Europeans are more likely to gray than Asians and Africans.
C. Gray hair means poor health or a sign of illness.
D. Everyone will inevitably get gray hair by retirement age.
3.Which is not among the reasons for hair turning gray according to the passage?
A. Being physically weak. B. Stress from different sides.
C. Death of melanocyte cell. D. Genetic factors.
4.What does “silver bullet” in the last paragraph probably mean?
A. Make-up B. Scientific research. C. Chemical weapon. D. Cure.
LIKE many teachers, Cristi Derow and Jennifer Bradley have spent most of their careers giving classroom lectures to students who sat passively in their seats.
The Lewisvillle, Texas, school teachers were aware that the hours they spent on preparing lessons were too often wasted on many students. So Forestwood High School, Texas, used the “flipped (翻转的) classroom” method of instruction. “We’ve completely done away with our lecture,” Derow said. And homework assignments “are all done in class,” Bradley said.
With the flipped concept, a student’s usual homework assignment is to watch pre-recorded lectures on their computers or smart phones.They walk into class ready to discuss the topic, collaborate(合作) with other students and work on assignments based on what they learned from the video. Free from lecturing, the teachers can use class time to look deeper into the subject and focus on difficult concept. As students change from a passive to an active role, they learn critical thinking skills, learn to collaborate and become independent learners.
Instead of doing homework assignments alone at home, students are now “working together, talking about it,” Bradley said. “If they don’t agree on an answer, they debate it and have to justify their answers. It’s a higher level of learning.”
Her students give the flipped classroom high marks.
Sarah Lee, 14, watches the 30-minute videos on a home computer. She likes the ability to rewind the tapes if she doesn't understand a concept. She also likes being able to watch the lessons on her own schedule.
One of her classmates, Dawson Depperschmidt has the same idea and thinks the time she spends in the classroom is more productive. “It gives us more time to learn at school,” Dawson said. “You get more in-depth in class.
1.What can we conclude from the first two paragraphs?
A. Teachers in Lewisville enjoyed giving classroom lectures.
B. It takes time for students to concentrate and understand in class.
C. Many students took an inactive part in lecture-style classes.
D. Teachers in Lewisville found that there was no need to prepare lessons.
2.What difference does the “flipped classroom”method make to students?
A. They have more arguments with classmates.
B. They have to be independent and cooperative.
C. They need to do more homework at home.
D. They have to prepare lectures by themselves.
3.What does the underlined word “productive” mean?
A. reducing difficulties B. trying new methods
C. achieving a lot D. causing troubles
4.What are the benefits of the “flipped classroom” method?
a. Teachers have time to solve deeper problems
b. Students are engaged in a higher level of learning.
c. Students study according to their own schedule.
d. Teachers don’t have to design homework for students
A. a, b, c, B. a, c, d C. b, c, d D. a, b, d
This charming table lamp is a wonderful way to add customized color and accented lighting to a room. Turn on this light and give your home the soft glow while adding a natural style to your home. The lamp comes with an on/off switch for easy lighting control.
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* Measurements: (5.25 inches W×5.25 inches D ×8 inches H )
* Handcrafted by skilled artisan; light bulb not included.
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You will love this coffee table with a traditional style. You can place this elegant table in your living room for an instant style update. This beautiful pie-shaped table features a lift top for convenience, in a warm dark walnut finish that will add depth to your room. An angular apron(板) at the base, and silver metal feet complete the fine look. Create a warm and welcoming living room that is great for entertaining, with this excellent cocktail table.
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1.What is the purpose of writing the passage?
A. To make advertisements for the three items.
B. To attract more and more tourists.
C. To make more money from the goods.
D. To make preparations for an auction.
2.What’s the advantage of the coffee table?
A. It is worth collection.
B. It makes the room more convenient.
C. Its top is purely made of silver metal.
D. Its shape can be easily adjusted.
3.We can infer from the passage that the Home Office Desk is ___.
A. totally made of dark walnut wood
B. meanwhile sold with a personal computer
C. designed to protect individual privacy
D. only allowed to be used at home
4.Which of the above goods has the least discount?
A. A charming table lamp. B. The Home Office Desk
C. The lovely coffee table. D. None of them
In the 1950s, a family that owned a farm near Beulah, Michigan kept a bull chained to an elm (榆树). The bull paced around the tree, dragging the heavy iron chain, which led to a groove (槽) in the bark . The groove deepened over the years. Though for whatever reason, it did not kill the tree.
After some years, the family took their bull away. They cut the chain, leaving the loop around the tree and one link hanging down.
Then one year, agricultural disaster struck Michigan in the form of Dutch Elm Disease. All of the elms lining the road leading to the farm became infected and died. Everyone thought that the old elm would be the next.
The farm owners considered doing the safe thing: pulling it out and cutting it up into firewood before it died. But they simply could not bring themselves to do it. It was as if the old tree had become a family friend. So they decided to let nature take its course.
Amazingly, the tree did not die. Nobody could understand why it was the only elm still standing in the county!
Plant experts from Michigan State University came out to observe the tree. They observed the scar left by the iron chain, now almost completely covered by bark. The experts decided that it was the chain that saved the elm’s life. They reasoned that the tree must have absorbed so much iron from the chain that it became immune to the virus.
It’s said that what doesn’t kill you will make you stronger. Or, as Earnest Hemingway put it, "Life breaks us all, but afterwards, many of us are strongest at the broken places."
1.What did the family do with the elm when the agricultural disaster hit Michigan one year?
A. They invited plant experts to observe it.
B. They pulled it out and chopped it up into firewood.
C. They prevented it from being infected by the disease.
D. They did nothing and just let it be.
2.Which of the following statements is TRUE?
A. A groove formed because of natural forces.
B. The family decided to keep the tree because they had become attached to it.
C. All of the elms in Beulah, Michigan died of the disease.
D. The plant experts advised the family to chop it down.
3.What actually saved the elm?
A. The bull. B. The groove. C. The iron chain. D. The experts.
4.What would be the best title for the passage?
A. Let nature take its course
B. Strengthened by our wounds
C. Constant dripping wears away a stone
D. Bend, but don’t break
阅读下列短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。
A group of frogs was traveling through the woods and two of them fell into a pit(坑). All the other frogs gathered around it and watched as the two frogs tried to jump out. The pit was very deep and it looked as if there was no way , so they started yelling at the two frogs to . "The pit is too deep. You will die," they said together. When the frogs kept trying, the crowd yelled . After a while, one of the frogs believed what the others were saying, and fell down and .
But , the second frog kept jumping hard the negative remarks of those that kept yelling at her to accept the and just die. Finally, with one big leap, she it out of the pit!
In fact, the second frog was and unable to hear what the others had been saying. She thought they had been her on the entire time they were yelling! What she had considered as encouragement her to try harder and succeed. And that made all the !
With a positive and being deaf to others' opinions, the second frog reached her goals by using such as encouragement, instead of being by others like the first frog, who failed to develop her to struggle for survival. , when we overcome others' criticism or comments, we can do anything we set our minds to, just as the second frog did.
1.A. away B. out C. on D. over
2.A. give up B. give out C. drop out D. drop in
3.A. lost B. missed C. trapped D. tired
4.A. higher B. louder C. clearer D. bigger
5.A. died B. stopped C. rested D. watched
6.A. obviously B. disappointingly C. undoubtedly D. amazingly
7.A. besides B. for C. despite D. except
8.A. problem B. life C. chance D. fate
9.A. made B. jumped C. took D. saved
10.A. dumb B. deaf C. lame D. blind
11.A. calling B. holding C. cheering D. pushing
12.A. mistakenly B. Brightly C. roughly D. perfectly
13.A. let B. attracted C. inspired D. kept
14.A. result B. difference C. achievement D. progress
15.A. expression B.Emotion C. soul D. attitude
16.A. possibility B. certainty C. cruelty D. negativity
17.A. influenced B. threatened C. suspected D. advised
18.A. energy B. spirit C. potential D. mood
19.A. However B. Thus C. Finally D. Actually
20.A. surprising B. annoying C. discouraging D. confusing
Mo Yan, a Nobel Prize winner in Literature, grew up listening to folk tales that __ for centuries in his hometown.
A. have been told B. had been told C. were told D. have told
