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.

　　64. 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. 

　　65. One of the functions of the molecules mentioned above is _______.

　　A. carrying oxygen around the body                 B. improving athletes’ performance

　　C. detecting oxygen                                         

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