Pregnancy Anomalies May Lower Breast Cancer Risk
    1.题目：Which of the following may have NOTHING to do with a decline in breast cancer incidence？
    答案：D）Experiencing serious morning sickness during the early period of pregnancy.
    2.题目：According to the study， what on earth may play an important role in lowering breast cancer risk？
    答案：B）The changes in the levels of hormones and other substances in the mother's body.
    3.题目：From the fifth paragraph we may infer that pregnant women whose blood pressure ________ may have the least risk of breast cancer.
    答案：C）increases the most
    4.题目：Which of the following is NOT a function of the placenta？
    答案：C）Protecting the mother against breast cancer.
    5.题目：It seems that Cohn is ________ of finding out the exact mechanisms at work.
    答案：A）confident
    速记口诀：
    怀孕会降低乳腺癌发生率
    1.晨恶乳腺癌没关系____________________
    2.变化降低乳腺癌____________________
    3.增加最大少风险___________________
    4.保护母亲不正确____________________
    5.自信找到病机理____________________