当归的主要归经是
A．肺、胃、肾经B．肺、脾、肾经C．心、脾、肾经D．心、肝、脾经E．肺、肝、肾经
参考答案：D
The poor ________ living in the mountain ________ top is covered with green trees.
A．are; which
B．are; of which
C．is; whose
D．are; whose
钢渣中有害杂质最多的是（）。
A.S、P
B.As
C.Pb
D.K
