1 (2011北京卷,34）The employment rate has continued to rise in big cities thanks to the efforts of the local governments to increase .
A. them B. those C. it D. that
答案：C
解析：考查代词it的用法。句意为“由于当地政府的努力，大城市里的就业率持续升高。”it代指前面交代过的“the employment rate”，是单数，而them和those是复数。
