1.Painting in ____ is one of their spare-time activities.
A. oil B. an oil C. oils D.the oil
答：C
译：画油画是他们的业余活动之一.
析：首先楼主粗心将painting 打成了planting,一开始以为选项是soil 的变化,后一想不可能四个选项都笔误.后网络一搜索发现,原来是painting!
查oil: 4 oils [pl] paints made by mixing colouring matter in oil 油画颜料: paint in oils 画油画.
3.One of the most surprising things is that ____may come from petroleum.
A.much of tomorrow food B .many of tomorrow's food
C.much of the food of tomorrow D.much of tomorrow's food
答：D
译：最令人惊奇的一件事情是将来食物的大部分可能会从石油中提取出来.
析：food是不可数名词,不用many,排除B
tomorrow是名词,表示“未来的”可以用名词所有格,也可以用of所有格,排除A
此题设计有误.
查词典,知道,未来的世界可以说：the world of tomorrow《21世纪》
也可以说：tomorrow's world《牛津双解》
所以说CD都可以.不过以D为佳,因为C不够简洁,of用太多了.