— ______ Mr White good at singing?

—Yes, he teaches ______ music this year.[ ]

A. Does, us

B. Is, us

C. Does, our

D. Is , our

子宫收缩乏力可导致()。

A．产后出血

B．产程延长

C．产妇疲劳

D．胎盘滞留

E．尿潴留