F．Healthy foods provide nutrients to your brain cells to keep them energized.

　　G．We need to have a positive mental state if we want to improve our study efficiency.

　　答案：1～5　DAEFB语法填空(2016·宁夏回族自治区银川一中模拟)Scientists have discovered that

　　1.________ (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, 2.________

　　helps us lose weight. White fat stores extra energy, which results 3.________

　　weight gain. The researchers said that because air conditioning and heating give us constant,

　　4.________

　　(comfort) temperatures, our body's need for brown fat has decreased. They found that Outdoor workers in northern Finland who 5.________

　　(expose) to cold temperature have 6.________

　　significant amount of brown fat when

　　7.________

　　(compare) to same­aged indoor workers.

　　The research was conducted on two different control groups of mice. 8.________

　　group was injected with the protein that helps create brown fat. This group later gained 30% less weight after both groups were fed high­fat diets. The researchers say this could be good news in the fight against obesity. People who are obese have

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