下列各种疾病中哪项与雌激素无关
A．子宫内膜癌B．子宫内膜增殖症C．卵巢颗粒细胞瘤D．卵巢无性细胞瘤E．子宫肌瘤
参考答案：D
–What was your brother doing at this time yesterday?
–He was reading a magazine ________ I was writing an e-mail at home.
A．as soon as
B．after
C．until
D．while
在产品生命周期的（）阶段，促销显得十分重要。
A.成熟期
B.引入期
C.引入期和成熟期
D.成长期
