“坊巷桥头及隐僻去处，俱是铺席买卖。”这则史料反映的商业繁荣的景象最可能出现在 [ ]
A、商代
B、汉代
C、唐代
D、宋代
答案：D
卵巢肿瘤最常见的并发症是
A．囊肿破裂
B．感染
C．恶变
D．蒂扭转
E．弥漫性腹膜炎
___________ is a fact that English is being accepted as an international language. [ ]
A. There
B. It
C. This
D. That
