It shocked us all        that little boy hadn’t been separated from that patient, he would have been infected with H1N1.   

A．if that

B．that if

C．if

D．that

具有完整细胞壁结构的微生物是（）。

A.支原体

B.衣原体原体

C.衣原体始体

D.细菌L型

E.病毒