题目

完形填空（共20小题；每小题1.5分，满分30分） 阅读下面短文，掌握其大意，然后从36-55题所给的A.B.C.D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。     Two brothers lived on the 80th floor. On coming home one day, they were depressed to realize that the lifts broke 36 . Although they carried a big pack of luggage, it seemed to have no other choice, so they decided to climb the 37 up together!     When they arrived at the 20th floor, the elder brother 38 putting the luggage there and coming back for it the next day. Feeling mucATP 是细胞的能量“通货”，下列有关ATP 的叙述正确的是（ ）A．三磷酸腺苷是生命活动的直接能源物质，其结构简式为 ATPB．蓝藻内产生 ATP 的场所有细胞质基质、线粒体以及叶绿体C．植物细胞产生的 ATP，均可用于一切生命活动D．ATP 水解失去2 个磷酸基团后，剩余部分是 RNA 的组成单位之一