题目

33．玉米茎杆细胞中最重要的二糖和多糖分别是(    ) ①乳糖和葡萄糖     ②乳糖和麦芽糖   ③蔗糖和麦芽糖   ④糖元和纤维素 ⑤植物淀粉和纤维素 A.①④                B.②⑤             C.③④                 D.③⑤ 答案：D A police office was killed when a bomb on his car ________． [　　] A． set up B． broke up C． blew up D． fired up