下列哪些抗菌药不宜儿童使用：（）
A、四环素类
B、庆大霉素
C、氟喹诺酮类药
D、氯霉素类
E、以上都是
参考答案：E
Usually children are allowed to ______ when they are six years old.
A．attend school
B．attend the school
C．join school
D．join the school
