第一节 完形填空(共20小题;每小题1.5分,满分30分)
Today vegetables, fish, fruit, meat and beer are canned in enormous quantities. Within three generations the 1 habits of millions have been revolutionized. Foods that were previously 2 may now be eaten at any time, and strange foods are 3 far from the countries where they are 4 . The crops many farmers now produce often depend on the nearness of a canning factory.