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： 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。