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    A breathtaking trick potentially left over from our ancestors might be found in us — the ability to sense oxygen through our skin.
    Amphibians, animals such as frogs that can live both on land and in water, have long been known to be capable of breathing through their skin. In fact, the first known lungless frog that breathes only through its skin was discovered recently in the rivers of Borneo.
    Now the same oxygen sensors found in frog skins and in the lungs of mammals (哺乳动物) have unexpectedly been discovered in the skin of mice.
    “No one had ever looked,” explained Randall Johnson, a biologist researcher.
    Mice and frogs are quite distant relatives, so the fact they have these molecules (分子) in common in their skin suggests they might well be found in the skin of other mammals, such as humans.
    “We have no reason to think that they are not in the skin of people too,” Johnson said.   These molecules not only detect oxygen, but help increase levels of vital red blood cells, which carry oxygen around the body. Normal mice breathing in air that is 10 percent oxygen—a dangerously low level similar to conditions at the top of Mount Everest, and about half that of air at sea level. However, mice that had the oxygen sensor HIF-1a genetically removed from their skin failed to produce this hormone (荷尔蒙) even after hours of such low oxygen.
    These findings, if they hold true in humans, suggest one could raise the level of oxygen circulating inside the body. This could help treat lung diseases and disorders such as anemia (贫血症) without injecting drugs, which make up a multibillion-dollar market, Johnson said.
    Athletes also often try to get more oxygen delivered to their muscles in order to improve their performance. They often do this by training at high altitudes or in low-oxygen tents. The new study suggests they might want to expose their skin as well as breathing in low-oxygen air to improve their performance. “It’s hard to say what exactly might be done, however—there’s a lot we don’t know yet,” Johnson explained.
    The scientists detailed their findings in the April 18 issue of the journal Cell.
    49. Which of the following statements is TRUE according to the passage?
    A. Johnson believes that Oxygen sensors also exist in human skin.
    B. People have to surf the Internet to read detailed findings.
    C. It has been proved that these findings help treat lung diseases.
    D. It has long been expected oxygen sensors exist in mice’s skin. 
    50. One of the functions of the molecules mentioned above is _______.
    A. carrying oxygen around the body                   B. improving athletes’ performance
    C. detecting oxygen                                          D. increasing level of oxygen
    51. What is Johnson’s attitude to the application of the findings to the athletes’ training?
    A. Negative                  B. Doubting                  C. Positive             D. Hesitating
    52. The best title of the passage may be _______.
    A. Great Findings Benefits Athletes A Lot
    B. Frogs And Mice Are Distant Relatives
    C. First Known Animal Breathes Through Skin
    D. Humans Might Sense Oxygen Through Skin

    小题1:A
    小题2:C
    小题3:C
    小题4:D
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    科目：高中英语 来源：不详 题型：阅读理解

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    科目：高中英语 来源：不详 题型：阅读理解


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    科目：高中英语 来源：不详 题型：阅读理解

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    科目：高中英语 来源：不详 题型：阅读理解


    E
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    A. Girls are more emotional than boys.
    B. Girls have more brain cells than boys.
    C. The amygdala is located in different areas of the brain for boys and girls.
    D. The links between certain parts of the brain develop earlier in girls than in boys.
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    A. Girls need more training in communication.
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    C. Parents should pay more attention to boys.
    D. Sex differences should be ignored in education。
    70．What does the phase “cling to” in the first paragraph mean?
    A. maintain               B. abandon                         C. evaluate          D. challenge

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    科目：高中英语 来源：不详 题型：阅读理解


    Tears are nature's way of making us feel more comfortable. When our eyes is made uncomfortable by some small pieces of pollution, or when we are cutting onions, or when we are exhausted and “red –eyes” from over work and late hours, tears form in our eyes to clean and re-flesh them.
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    科目：高中英语 来源：不详 题型：完形填空


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    第一节：完形填空（共10小题；每小题2分, 满分20分） 
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    Rubber ducks are being used to help scientists understand global warming and melting glaciers. NASA researchers have  21   90 ducks into holes in Greenland's fastest moving glacier, the Jakobshavn Glacier between Greenland and Canada. The   22   have each been marked with the words "science experiment" along with an e-mail address. If they are found scientists will be able to  23   how the water moves through the ice and provide information about the   24   of glaciers. Scientists are still   25   about why glaciers speed up in summer and head towards the sea. One theory is that as the summer sun melts ice on top of the glacier's surface, the water moves to the bottom of the glacier, where it helps to   26   the movement of ice toward the coast. The Jakobshavn Glacier is believed to be the   27   of the iceberg that sank the Titanic in 1912. Robert Jones, the experiment organizer, said none of the ducks had been   28   yet. "We haven't heard back but it may take some time until somebody actually finds it and decides to send us a/an   29   that they have found it," he said. "These are places that are   30   so there aren't people walking around."
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    22. A. results            B. toys               C. glaciers          D. scientists
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    26. A. reduce          B. control        C. speed         D. stop
    27. A. position               B. source            C. reason            D. result
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    30. A. hidden          B. lost                C.    remote       D. quiet

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    科目：高中英语 来源：不详 题型：阅读理解


    A survey has found that in adolescence (青春期) a lack of physical activity is connected with emotional and behavioral problems. More than 7,000 teenagers in Finland took part in the survey that judged their levels of physical activity and mental and emotional health. Boys who reported less than one hour of physical activity a week were more likely to be anxious and sad than boys who were more active. Girls who were not active had similar problems, and were more likely than boys who were not active to have sleep problems and break school rules.
    The researchers concluded that both boys and girls who are not active are more likely than active ones to have social and attention problems.
    “Adolescence is already a difficult stage of life-emotionally, mentally and physically,” study author Marko T.Kantomaa said in the American College of Sports Medicine.
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    D. inactive boys are more likely to break rules than inactive girls
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    A. Anxiety.     B. sleeplessness.    C. Inattention.   D. unkindness.
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    C. plenty of physical activity is effective in developing healthy habits
    D. physical exercise is the only way to cure mental problems
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