影响水和食物中氟收吸率的因素包括（）
A.氟化物的溶解度
B.氟的数量多少
C.胃的pH值
D.A+B
E.A+C
参考答案：E
I called Hannah three times yesterday evening, but I couldn’t get through, her brother _______on the phone all the time.
A．was talking
B．has been talking
C．has talked
D．talked
招商局（）的建立具有极其深远的历史价值。
