题目

 Left at home alone，he felt afraid and couldn't ________ himself ________ fear. A. put; into B. tire; of             C. rid; of              D. protect; from 答案：C下列物质中含有氧分子的是BBA、髙锰酸钾      B、液态氧         C、二氧化碳  D、空气空气．