His mother kept telling him to          his manners at the party.So he became impatient.

A．mind

B．notice

C．watch

D．care

细菌L型是

A．细胞膜与细胞壁缺损的细菌

B．细胞核缺陷和缺乏质粒的细菌

C．细胞膜和核质缺乏的细菌

D．细胞壁缺陷的细菌

E．细胞膜的外膜层缺陷的细菌