三月五号北美狗考前没看作文寂静,考完了翻了一下貌似没有这个题
有一个理论,the cost of processing is decreasing in years. for example, the costs of a 8-by-6 inches photograph(还是什么别的相纸)is 50 cents in 1970, while the costs is 20 cents in 1984. Then 推断出,costs一直降低,然后Olympic Foods is approaching and we could minimize the costs and maximize the profits.