题目

The writer was so ________ in her work that she didn't notice him enter the room.A.abandonedB.focusedC.absorbedD.centered 答案：【答案】C【解析】句意：这位作家专心致志于她的工作，没有注意他进了房间。be absorbed in固定短语，“专注于，全神贯注于……”，选C。一辆公共汽车进站后开始刹车，做匀减速直线运动．开始刹车后的第1s内和第2s内位移大小依次为9m和7m．则第1s末的瞬时速度为________m/s，物体的加速度为________m/s2．