题目

To our surprise, we got ______ people to attend the meeting as we expected. A. as twice      B. twice many    C. twice many as    D. twice as many 答案：D 在其他条件不变而酶浓度增加时，下列图中能正确表示生成物量变化的是（图中虚线为酶浓度增加后的变化曲线） [　　] A． B． C． D．