人体感染囊虫病的方式有（），（），（）。
参考答案：自体内感染、自体外感染、异体感染
Many people are wearing gloves and coats. So I think it is _________ outside.
A．hot
B．warm
C．cool
D．cold
________ the arrival of the police, I would have been robbed by two masked men.
A．Had it not been for
B．If it were not for
C．Had it been not for
D．If it would not be for
