下列哪种细胞在结构上与其他三种不一样[ ]
A．大肠杆菌
B．颤藻
C．酵母菌
D．发菜
答案：C
A tourist will easily lose his way in Shanghai_____ he has a map or a guide.
A．if
B．since
C．while
D．unless
心搏骤停的类型有哪些？
