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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

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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.
【C18】
选项 A、content
B、composition
C、constitution
D、distinction
答案B
解析 上文提到科学家们做实验来证实老鼠体内两种脂肪的作用和相互关系。根据下一句实验结果“一些有害白色脂肪已经被好的褐色脂肪所替代”，他们是在查看脂肪中构成的变化，选B项composition“组成”。本词在上文中出现过，属于原词出现。A项fat content“脂肪含量”指的是脂肪在体内的所占比例，而这里讲的是构成脂肪的成分变化。C项constitution“体格；宪法”，与fat无法构成搭配。D项distinction“区别”，常指两者相比之下的不同，而本句并没有出现两个比较的对象。
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