【正确答案】 C

【答案解析】[解析] 本题是近形动词词辨析题。空格中动词宾语为代词them(指代properties财产)，空格后为介词against disasters and theft．由此可以推断空格中动词意思为“为……保险”，所以答案为C。assure向……保证；使放心：～you of the reliability of the news/you that the news are reliable；ensure确保：～one's safety/success/the supply of the necessities；insure保险：～house against fire/life against accident；secure使安全；安全的：～the coast areas from the food；feel～with you beside me。