题目

组成细胞的分子或结构通常具有“骨架”。下列与此有关的叙述，错误的是（ ） A . 由碳链为基本骨架构成的单体可连接成多聚体 B . 脂肪是多聚体，其单体是油和脂肪酸 C . 磷脂双分子层构成了生物膜的基本骨架 D . 细胞骨架是由蛋白质纤维组成的网架结构 答案：B. The jewelry shop is reported in the local newspaper ___ last night. A. to have robbed            B. having been robbed C. to be robbed              D. to have been robbed