一患者术前合并风心病二尖瓣狭窄，但能正常工作生活，其ASA分级为（）
A.Ⅰ级
B.Ⅱ级
C.Ⅲ级
D.Ⅳ级
E.Ⅴ级
参考答案：B
_____, he together with his families ____ escaped from the shaking building when the earthquake struck Lushan County of Ya’an.
A．Unfortunately; narrowly
B．Fortunately; narrowly
C．Absolutely; thankfully
D．Sadly; hopefully
钩藤( )
A．薄壁细胞中含草酸钙簇晶，直径达40μmB．纤维束周围细胞含草酸钙方晶，形成晶纤维C．薄壁细胞中含草酸钙柱晶D．表皮细胞外侧角质增厚E．薄壁细胞中含草酸钙棱晶
