题目

Scientists have discovered that  ____61____(stay) in the cold could help us lose weight. Researchers at the University of California found that exposure to the cold increases levels of a protein that helps form brown fat -------- the type of fat that produces heat and keeps us warm. Brown fat burns energy, _____62______ helps us lose weight. White fat stores extra energy, which results _____63_____ weight gain. The researchers said that because air conditioning and heating give us constant,  _____64_______(comfort) temperatures, our body's need for brown fat has decreased. They found that: "Outdoor workers in northern Finland who ______65______(expose) to cold temperature have ____66_____ significant amount of brown fat when  ____67_____(compare) to same-aged indoor workers." The research was conducted on two different control groups of mice. ____68_____ group was injected with the protein that helps create brown fat. This group later gained 30% less weight after both groups were fed high-fat diets. The researchers say this could be good news in the fight against obesity. People who are obese have  ＿＿69＿＿（low) levels of brown fat than thinner people. Head researcher Hei Sook Sul said: "This protein could become an important target for research into the treatment and prevention of obesity and obesity-related diseases." She added: "If you can somehow increase levels of this protein, you could ____70_____(possible) lose more weight even if eating the same amount of food. 答案：61. staying   62. which       63. in     64. comfortable   65. are exposed 66. a        67. compared    68. One   69. lower        70. possibly

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