题目

Independent innovation（创新）has brought us a boom in profits, 40%higher than we made _______ in the traditional way. A. produce       B. to produce       C. producing        D. having produced 答案：C脂质主要包括3种：A.脂肪、磷脂、固醇B.脂肪、磷脂、胆固醇C.脂肪、性激素、固醇D.脂肪、磷脂、性激素