I saw Tom in the meeting-room, so he      attend the meeting.

A．surely

B．did

C．does

D．really

酚类化合物控制菌斑的机制是

A．抑制细菌酶
B．干扰菌斑的附着
C．清除菌斑中内毒素
D．改变细菌胞膜的通透性
E．影响菌斑繁殖