风机通讯光纤分为（）和（）两种。
参考答案：单模；多模
文艺复兴的策源地是( )
A．法国
B．英国
C．德国
D．意大利
“Don’t talk in class again ”, the teacher said to him .
The teacher ________.
A．asks him not to talk in class again
B．told him to not talk in class again
C．asked him to not talk in class again
D．told him not to talk in class again
ld him to not talk in class again