问题
单项选择题
Heart ______ is much more common these days than it was even ten years ago.
A．surgery
B．surgeon
C．work
D．circulation
答案
参考答案：A
解析：[分析] 词义辨析 A．surgery外科(学)，(外科)手术；B．surgeon外科医生；C．work工作，职业； D．circulation循环，流通；因此A为答案。