【题目】Cells are important because they are organized structures that help living thing the activities of life.
A. carry on B. expand on
C. put on D. hang on
在线课程【答案】A
【解析】A考查动词短语。句意：细胞是重要的，因为它们是有组织的结构，帮助生物进行生命的活动。A. carry on继续，参与；B. expand on详述；C. put on穿上，上演；D. hang on坚持下去。故选A。