A. They were relatively few in number. B. They knew how to use bows and arrows. C. They were concentrated in a small area. D. They were skilled hunters. 参考答案:C
第35题: [单项选择]关于低促性腺激素性闭经,以下哪项不正确() A. 一般卵巢分泌雌激素不受影响 B. 雌、孕激素的周期疗法一般以6个周期为一疗程 C. 雌、孕激素周期疗法可纠正合并的高雄激素血症 D. 先行人工周期,再用氯米芬促排卵效果好 E. 氯米芬可以调整FSH与LH的比例 参考答案:D 答案解析:低促性腺性闭经属垂体或下丘脑性闭经,主要表现为促性腺激素分泌不足,无卵泡发育,雌激素低落,长期闭经,乳房与生殖器萎缩等,雌、孕激素周期治疗是促使子宫内膜的周期性变化,形成人工周期不能纠正高雄激素血症。