According to The Environmental Quality Standards for Surface Water introduced in 2002, water at Grade V is______. ( ) A: unusable B: the best C: for industry usage D: for agriculture and general landscape usage

The biggest problem with traditional print textbooks is that they become unusable once a new edition comes out. A: A B: B C: C D: D E: E F: F G: G H: H I: I J: J K: K L: L M: M