(1/2-1/3)+(1/3-1/4)+(1/4-1/5)
A.1/10
B.1/5
C.3/10
D.2/5
参考答案:C
—Did you watch the basketball match?
—Oh, my alarm clock didn't _________. When I woke up the match had been over.[ ]
A. go on
B. go away
C. go up
D. go off
女,28岁,有正常性生活,婚后3年未孕。既往体健,月经规则,4~5/28,经量中等;妇科盆腔检查正常,男方检查未发现异常。为确定不孕的原因,首先应采取的特殊检查是()
A.经前子宫内膜活检
B.子宫输卵管碘油造影
C.输卵管通液术
D.宫腔镜检查
E.基础体温测定