蝇传播疾病的主要方式是
A．增殖式B．机械性传播．C．经卵传递式D．发育式E．发育增殖式
参考答案：B
某装置电月耗为125000千瓦时，处理量为91700吨，那么电单耗应为（）千瓦时/吨。
A、1.36
B、1360
C、7.33
D、0.733
The taxi was held up on the way to the railway station, otherwise I ______ the train.
A．must catch
B．have caught
C．could have caught
D．ought to catch
