半固体培养基便于观察细菌是否有下列哪种结构（）。
A.菌毛
B.鞭毛
C.荚膜
D.芽胞
E.磷壁酸
参考答案：B
A．A car bomb was exploded near the Associated Press office.
B．A Spanish businessman was kidnapped by unidentified armed men.
C．A dealer in Volkswagen cars was arrested by Palestinian police.
D．An A.P. photographer was taken away by masked gunmen.
高分子
