在小鼠静脉注射中药物的使用剂量一般为（）.
A、0.1-0.2ml
B、0.2-0.3ml
C、0.2-0.4ml
D、0.1-0.3ml
参考答案：A
Miss Wang asks the students in the river, because it’s too dangerous.
A．swim
B．to swim
C．not to swim
D．to not swim
