此题要求改正所给短文中的错误。

May I have you attention please? I have a little things to tell you. When you have a class here in the language lab, please be here a little early. Change your shoes before enter the lab. Don't bring anything here except your text books. When you are into, please don't touch these machine without permission. Always do as the teacher tell you to. In class you should only speak the English, not Chinese. Recorders can be used make a copy of the listening materials. When class over, turn off your machines and leave the lab one by one.

T细胞的生物学功能不包括( )

A．产生细胞因子
B．直接杀伤靶细胞
C．参与对病毒的免疫应答
D．诱导抗体的类别转换
E．介导ADCC效应