问题补充:
-- of the population of the city workers?
--About 60 percent.
A. What; is
B. What; are
C. How much; is
D. How much; are
答案:
A. What; is
B. What; are
C. How much; is
(答案→)D. How much; are
解析:考查population的用法。对人口“提问”,用what来问总人口;how much问的是“多少(比例)”。句意“这个城市人口的多少比例是工人?”“大约60%。”population作主语,谓语用单数,但是指具体的人数时,谓语用复数。故选D。