车辆的高带档通常用于正常路况下（）距离行驶。
A、短
B、长
C、上坡
D、下坡
参考答案：B
_______ basic first-aid techniques will help you respond quickly to emergencies.
A．Known
B．Having known
C．Knowing
D．Being known
可以发生湿性坏疽的器官是______
A．阑尾
B．心
C．肝
D．脾
E．肾
