题目

The old man has been living by________ since his children went abroad. A. himself  B. him  C. his   答案：A  下列关于氯气的叙述中正确的是下列关于氯气的叙述中正确的是A.在任何条件下，氯气的密度比空气大B.氯气有毒，故氯气在工业上无实用价值C.氯气比较容易液化D.氯气溶于水得到液氯