治疗卵巢性闭经可采取下列哪项措施
A．雌激素
B．药物刮宫术
C．诊断性刮宫术
D．克罗米芬
E．大量止血药物
参考答案：D
He was ill and had two weeks ______.[ ]
A. of
B. away
C. off
D. out
简述细菌耐药机制。
