A new study has found no evidence that sunscreen, commonly used to reduce the risk of skin caner, actually increases the risk.
Researchers from the University of Yale based their findings on a review of 18 earlier studies that looked at the association between sunscreen use and melanomas (黑素瘤). They said that they found flaws in studies that had reported associations between sunscreen use and higher risk of melanoma.
Most health experts believe that by protecting the skin from the harmful effects of the sun, sunscreen helps prevent skin cancer, which is increasing in incidence (发生率) faster than any other cancer in the United States.
But questions have been raised about sunscreen and whether it may have the opposite effect, perhaps by allowing people to remain exposed to the sun longer without burning.
The researchers said that among the problems with some earlier studies is that they often failed to take into account that those people most at risk for skin cancer—people with fair skin and freckles (雀斑), for example—are more likely to use sunscreen. As a result, it may appear that sunscreen users get cancer more often.
The studies, which generally relied on volunteers to recall their sunscreen use, were also unable to prove how well the products had been applied, said the new study.
1.The underlined word “flaws” in the 2nd paragraph most probably means .
A. evidences B. facts C. faults D. failures
2.People with fair skin and freckles .
A. seldom use sunscreen B. are more in danger of skin cancer
C. can be free from the harm of the sun D. often expose themselves to the sun
3.We can learn from the passage that .
A. sunscreen users get skin cancer more often
B. the volunteers have proved the effect of sunscreen
C. the new study was based on the experiences of volunteers
D. the number of skin cancer patients is increasing in America
4.Which of the following can be the best title for this passage?
A. Sunscreen to Prevent Skin Cancer
B. Sunscreen to Increase Skin Cancer
C. Skin Cancer Caused by Sunscreen
D. Skin Cancer Caused by Freckles
One fine afternoon, I was walking along Fifth Street when I remembered that it was necessary to buy a pair of socks. Why I wished to buy only one pair was unimportant. I turned into the first sock shop that caught my eye. A boy clerk, who could not have been more than seventeen years old came forward. “What can I do for you, sir?” he said “I wish to buy a pair of socks.” I replied.
His eyes shone. There was a note of excitement in his voice. “Did you know that you had come into the finest place in the world to buy socks?” I had no idea of that, as my entrance had been accidental. “Come with me,” said the boy, eagerly. I followed him to the back of the shop, and he began to pull down box after box from the shelves, showing their contents (内装物)for my choice.
“Hold on, lad” I said “I am going to buy only one pair!” “I know that,” said he, “but I want you to see how beautiful these are. Aren’t they wonderful!” There was on his face an expression of seriousness and pride and delight as if he were showing me the secrets of his religion（宗教信仰）. I became far more interested in him than in the socks. I looked at him in surprise. “My friend, ” said I, “if you can keep this up, if this is not merely from having a new job, if you can keep up this high spirit and excitement day after day, in ten years you will own every sock in the United States.”
1.What did the writer want to buy one fine afternoon?
A. A pair of shoes. B. A pair of socks.
C. Two pairs of socks. D. A set of books.
2.Which is true according to the passage?
A. The shop was on the Second Road. B. The boy was 18 years old.
C. The boy was not in high spirits. D. The writer entered the shop by chance.
3.What the writer said in the last paragraph means that ______.
A. if you don’t work hard, you will lose the job
B. you should keep on following your customs
C. if you keep up your great interest in your work, you will succeed in the future
D. if you are too hardworking, you will fail
One day a very wealthy father took his son on a trip to the country with the firm purpose of showing his son how poor people can be.
They spent a couple of days and nights on the farm of 36 would be considered a very poor family. On their 37 from their trip, the father asked his son, “ How was the trip?”
“It was 38 , Dad .”
“Did you see how poor people can be?” the father asked.
“Oh yeah?” said the son.
“So what did you 39 from the trip?” asked the father.
The son answered, “I saw that we have one dog and they have four. We have a pool that 40 to the middle of our garden and they have a creek (小溪) that has 41 end. We have lanterns in our garden and they have the 42 at night. We have a 43 piece of land to live on and they have fields that go 44 our sight. We have servants who serve us, but they serve 45 . We buy our food, but they grow theirs. We have 46 around our property（财产） to protect us but they have friends to protect them.”
With this the boy’s father was 47 .
Then his son 48 , “Dad, thank you for showing me how 49 we are.”
Too many times we 50 what we have and concentrate on what we don’t have. What is one person’s 51 object is another’s prize possession. It’s all 52 on one’s perspective (视角). Think about what would happen if we all gave 53 for what we have, 54 worrying about what we don’t have.
Be thankful for every single thing in your life, exactly as it is now–and 55 your friends. Be sure to take the time to express your appreciation and gratitude for the people whom you are close to.
1.A. which B. that C. what D. how
2.A. arrival B. return C. coming D. reach
3.A. shameful B. disappointing C. surprising D. great
4.A. suffer B. regret C. hear D. learn
5.A. reaches B. gets C. arrives D. flows
6.A. much B. some C. no D. another
7.A. stars B. lights C. darkness D. torches
8.A. smooth B. full C. large D. small
9.A. through B. within C. beyond D. across
10.A. themselves B. visitors C. friends D. us
11.A. dogs B. walls C. soldiers D. policemen
12.A. discouraged B. satisfied C. delighted D. speechless
13.A. explained B. announced C. informed D. added
14.A. poor B. wealthy C. lucky D. proud
15.A. miss B. forget C. remember D. consider
16.A. valuable B. useful C. priceless D. worthless
17.A. based B. concentrated C. decided D. laid
18.A. love B. concern C. thanks D. interests
19.A. more than B. along with C. instead of D. except for
20.A. especially B. besides C. specially D. only
―I think it’s too late to apologize to Kate.
―Never mind. _______.
A. Good medicine tastes bitter
B. Better late than ever
C. All good things come to an end
D. A man becomes learned by asking questions
Having ________ every night is very important for your health.
A. a good amount of sleeps B. a number of sleep
C. a good amount of sleep D. a great deal of sleeps
He made three good friends in the university, ______ joined the army after graduation.
A. one of them B. one of whom C. one D. one of which
