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  3. Doctors and researchers have begun to look for causes of overweight in a critical period of life—the nine months before birth. R

Doctors and researchers have begun to look for causes of overweight in a critical period of life—the nine months before birth. R

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问题     Doctors and researchers have begun to look for causes of overweight in a critical period of life—the nine months before birth. Research has found that women who gain too much weight in pregnancy【C1】______to have heavier babies, and that heavier babies are【C2】______more to obesity later on.
    However, for some time, researchers have not been able to【C3】______out the role of genes. A new study helps eliminate that【C4】______By looking at a large group of women who gave birth at least twice between 1989 and 2003, researchers were able to【C5】______different pregnancies in the same women. Based on the data, the authors【C6】______that maternal weight gain during pregnancy【C7】______to higher infant birth weights,【C8】______of genetic factors.
    The authors of the study【C9】______birth records of 513 501 women and their 1164 750【C10】______born over a 15-year period in New Jersey. However, researchers【C11】______mothers with gestational diabetes (妊娠糖尿 病) and babies born before 37 or after 41 weeks.
    【C12】______they found was that mothers who gained more than 53 pounds during pregnancy were more than twice as【C13】______to have a high-birth-weight baby as women who put【C14】______18 to 22 pounds. David Ludwig of Children’s Hospital Boston says "An【C15】______time to begin obesity prevention efforts for the next generation actually begins【C16】______birth."
    Traditionally the public-health focus has been【C17】______making sure that women gain enough weight during pregnancy, to【C18】______their risk of having babies with low birth weights. Now, however, 【C19】______more than half of the US population being either overweight or obese, the focus has largely【C20】______to the other end of the spectrum, to women who gain too much weight.
【C20】
选项 A、claimed
B、shifted
C、transmitted
D、spread
答案B
解析 动词辨析题。最后一段包括两句，其中however表明，两句之间是转折关系，第一句说明过去人们要求孕妇增加体重是为了减少超轻婴儿的出生几率，第二句则表达现在的情况，即现在人们已经转向关注增重过度的孕妇。因此shifted“转变”为正确答案。claimed“要求，主张”，transmitted“传输，传送”，spread“传播”，均不符合句意。
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大学英语四级

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