男性,78岁,既往患冠心病30余年,因寒热、大汗,在当地医院诊断为疟疾,下列哪种药慎用()
A.氯喹
B.磺胺类
C.伯氨喹啉
D.奎宁
E.青霉素
参考答案:A
Before the problem can be solved,it must be obvious ________ the problem itself is.(2011·湖南,31)
A.what
B.that
C.which
D.why
简述西方税收效率原则的内涵。