下列有关鸡内金的描述,正确的是()。
A.性味甘平
B.归脾、胃、小肠、膀胱经
C.化坚消石
D.研末服比煎剂好
E.脾虚无积滞者慎用
参考答案:A, B, C, D, E
WTO框架下,( )是唯一合法的保护方式。
A.配额
B.关税
C.进口许可
D.自动出口约束
The first textbooks written for teaching English as a foreign language ____ in the 16th century.
A.came about
B.came out
C.came along
D.came up