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  3. Scientists say they have found a way to turn body fat into a better type of fat that burns off calories and weight The US Johns

Scientists say they have found a way to turn body fat into a better type of fat that burns off calories and weight The US Johns

admin2022-01-04  34
问题     Scientists say they have found a way to turn body fat into a better type of fat that burns off calories and weight The US Johns Hopkins team made the【C1】________in rats but believe the same could be done in humans, offering the hope of a new way to treat obesity.
    【C2】________the expression of a protein linked to【C3】________not only reduced the animals’ calorie intake and weight but also【C4】________their fat composition.
    Brown fat is【C5】________in babies, which they use as a【C6】________source to generate body heat,【C7】________calories at the same time. But as we age our brown fat largely【C8】________and gets replaced by "bad" white fat, which【C9】________sits as a spare tyre around the waist.
    "We will need a lot more work to tease this out, but it could offer a(n)【C10】________way to develop new treatments for obesity", an expert said.
    Experts have【C11】________that stimulating the body to make more brown fat【C12】________white fat could be a helpful way to control weight and【C13】________obesity and its related health problems. Various teams have been searching for a way to do this, and Dr Sheng Bi and colleagues at the Johns Hopkins University School of Medicine believe they may have cracked it. They designed an experiment to see【C14】________suppressing an appetite-stimulating protein called NPY would decrease body weight in rats. When they silenced NPY in the brains of the rats they found their appetite and food【C15】________decreased. Even when the rats were fed a very【C16】________, high-fat diet they still managed to keep more weight【C17】________than rats who had fully functioning NPY. The scientists then checked the fat【C18】________of the rats and found an interesting change had occurred. In the rats with silenced NPY expression, some of the bad white fat had been replaced with good brown fat.
    The researchers are【C19】________that it may be possible to achieve the same effect in people by injecting brown fat stem cells【C20】________the skin to burn white fat and stimulate weight loss.
【C17】
选项 A、off
B、from
C、up
D、back
答案A
解析 由句首的Even when和本空格前的still所表示的递进转折语气可知，即使喂给这些老鼠高脂肪食物它们依然会比那些NPY功能正常的老鼠能减去更多体重，故A项off为正确答案。keep…off“让……远离”。B项keep…from“阻止，抑制”，from后要接动词-ing形式。C项keep…up“使不下降”，根据本句的比较级结构，此处说的减轻了更多的体重，而不是不下降。D项keep…back“留下”，代入句中意思不通。  
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