第7题: [单项选择]子宫节育器避孕原理,下列说法错误的是:() A. 通过异物的局部效应发挥作用 B. 异物刺激子宫内膜产生非细菌性炎症反应,不利于胚胎发育 C. 机械作用,阻止孕卵着床 D. 宫内节育器通过抑制下丘脑—垂体—卵巢轴起作用 E. 节育器刺激内膜产生前列腺素,影响孕卵着床 参考答案:D
第20题: [单项选择]A. At a newspaper. B. At an advertising agency. C. At a furniture store. D. At a real estate office. 参考答案:A 答案解析:[解析] 19-22 (Ring... ring... Sound of phone being picked up. ) M: (19) Hello, Campus Dai