（）inflation, driven by rising food and oil costs, is striking hardest at the world’s very poor, who are forced to spend 60 to 80 percent of their income on food.

单项选择题Because the workers were new and inexperienced, the manager had to watch them and （）their work closely.

A. attend
B. demand
C. analyze
D. supervise

单项选择题Among 169 cases, the smokers （）85.79% , and the ratio between males and females is 3.7 to 1.

A. answer for
B. account for
C. take up
D. sum up