可使二尖瓣狭窄的杂音更为清晰的情况是( )
A．左侧卧位
B．坐位稍向前倾
C．用力按压听诊器时
D．右侧卧位
E．屏住呼吸后
参考答案：A
It was ___ Li Ming had always been working hard that he was admitted to Beijing University last July.
___ the saying goes, "No pains, no gains". [ ]
A. because; As
B. as; Though
C. for; As
D. since; Where
“政治是国家意志的表现，行政是国家意志的执行。”这句话体现了公务员行为规范的（）特征。
A． 特定性
B．层次性
C．政治性
D．严肃性
