阅读理解Abreathtakingtrickpotentiallylefto

阅读理解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 mon 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 Cell1.Which of the following statements is TRUE according to the passage?A.It has long been expected oxygen sensors exist in mice’s skinB.People have to surf the Internet to read detailed findingsC.It has been proved that these findings help treat lung diseasesD.Johnson believes that Oxygen sensors also exist in human skin2.One of the functions of the molecules mentioned above is _______A.increasing level of oxygenB.improving athletes’ performanceC.detecting oxygenD.carrying oxygen around the body3.What is Johnson’s attitude to the application of the findings to the athletes’ training?A.HesitatingB.DoubtingC.PositiveD.Negative4.The best title of the passage may be _______A.Humans Might Sense Oxygen Through SkinB.Frogs And Mice Are Distant RelativesC.First Known Animal Breathes Through SkinD.Great Findings Benefits Athletes A Lot