--Everyone wants to keep healthy without too much effort.

--So let's start from our mouth by _______ those healthy foods, which people can easily get in their daily life.

A．buying

B．cooking

C． eating

D．throwing

缺乏细胞壁的原核细胞型微生物是

A．细菌L型
B．肺炎支原体
C．肺炎衣原体
D．螺旋体
E．立克次体