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  3. Scientists have developed a slimming (减肥) drug that successfully suppresses appetite and results in a dramatic loss of weight wi

Scientists have developed a slimming (减肥) drug that successfully suppresses appetite and results in a dramatic loss of weight wi

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问题     Scientists have developed a slimming (减肥) drug that successfully suppresses appetite and results in a dramatic loss of weight without any apparent ill effects.
    The drug interferes with appetite control and prevents the build-up of fatty tissue. Laboratory mice given the drug lost up to a third of their total body weight.
    Within 20 minutes of being given the drug, called C75, the mice lost interest in eating and survived apparently content on just 10 percent of the food they would normally eat.
    As a result, mice taking the drug lost 45 percent more weight than mice fed the same amount of food, which compensate for the lack of food by becoming more lazy.
    Scientists, from the Johns Hopkins University in Baltimore, said that C75 is likely to produce a similar effect on humans because appetite control in brain is thought to be based on the same chemical pathways as those in mice.
    "We are not claiming to have found a fabled (神奇的) weight-loss drug. What we have found, using C75, is a major pathway in the brain that body uses naturally in regulating appetite at least in mice," said Francis Kuhajda, a pathologist and senior team member.
The mice taking C75 lose nearly half of their weight on the same amount of food become______.
选项 A、more active
B、more lazy
C、more aggressive
D、more noisy
答案B
解析 事实细节题。根据文章第四段“…by becoming more lazy．”可知与食量相同的老鼠相比，服用这种药物时老鼠体重下降了45％，且其会变得更加懒惰。故选B项。
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