观察舌苔以辨别病邪深浅的主要依据是（）
A.舌苔的有无
B.苔色的黄白
C.舌苔的有根无根
D.舌苔的厚薄
E.舌苔的润燥
参考答案：D
Thunderstorms have struck northern China, ______ heavy rain and ______ traffic chaos.
A．brought, caused
B．bringing, causing
C．having brought, having caused
D．to bring, to cause
为什么要隔离病人？
