19世纪中叶，当时世界上唯一的工业国是（ ）
A．德国
B．美国
C．英国
D．法国
答案：C
19世纪中叶，最先完成工业革命的国家是英国。
阴虚动风证的临床特点是
A．手足蠕动B．四肢抽搐C．颈项强直D．眩晕欲仆E．头摇头痛
Great efforts to increase grain production _____ if food shortages are to be avoided. [ ]
A. could be made
B. must be made
C. might be made
D. would be made
