Q32:

To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

1. have to know a great deal more than now about the social and economic
2. have to know a great deal more than they do now about the social and economical
3. would have to know a great deal more than they do now about the social and economical
4. would have to know a great deal more than they do now about the social and economic
5. would have to know a great deal more than now about the social and economic

   why choose D? what is the difference between economical and economic?

"economic"指与经济活动有关的,做定语比较多吧

"economical"指短小精干节约节省的,做表语比较多吧

economic與economical意義完全不同。

economic: 經濟的，經濟方面的，比如:economic conditions, economic problems

economical:節儉的，比如:an economical housewife

這是ETS很喜歡的考點!