题目

 .More patients   ＿＿ in hospital this year than last year.A. treated    B. have treated   C. had been treated   D. have been treated 答案：D15．在横线中填上合适的单位．①一头大象约重5吨；　           ②小红身高约138厘米；③黑板的面积大约是400平方分米．