细菌在固体培养基上生长形成的菌落连成一片，称为（）
A.菌丝
B.菌膜
C.菌苔
D.菌团
E.菌胶团
参考答案：C
看图补全对话，每空一词。
A: Hello! Kate!
B: Hi! Mary! Look! What's that?
A: It's a (1) ______.
B: (2) ______ (3) ______ they (4) ______ now?
A: They are swimming.
B: (5) ______ (6) ______ they (7) ______ (8) ______?
A: They are from China.
下列哪项不是B细胞的免疫标志（）
A.CD10
B.CD19
C.CD68
D.HLA－DR
E.CD22
