警报信号的吹示方法为（）。
A、一长三短声
B、下行一长声，上行一短声
C、连续短声
D、一长一短声
参考答案：A
---Have you received Jack’s plan?
---Yes, but I don’t think his plan is _____．
A．worth being considered
B．worthy to be considered
C．worthy of considering
D．worth to be considered
五脏中，脾的气机主
A．升B．入C．降D．出E．升降
