[单项选择]Passage Two
Questions 57 to G1 are based on the following passage.
For most people, fat is a burden. It doesn’t really matter where it appears, we just don’t want it. But it turns out that our bodies also make a unique form of fat tissue that behaves remarkably unlike any other: rather than storing excess energy, this fat actually burns through it. It’s called brown fat and health experts confirm for the first time that healthy adults have stores of this tissue, which researchers hope to study further as a potential new weight-loss treatment.
Human newborns have been known to have any significant deposits of brown fat, so called because of its abnormally high concentration of dark---colored mitochondria (线粒体), the engines that sustain cell activity. The primary purpose of brown fat is to regulate body temperature: the mitochondria-packed cells are designed to burn high quantities of sugar, and release that energy as heat a mechanism that newborns rely on
A. it is totally impossible to lose weight by activating brown fat
B. our brown fat will be more active if we go to the North Pole
C. brown fat can surely make you thinner than before
D. to keep fit, an average person should eat 50g brown fat

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