题目

This camera is of good quality. If it ______ break down within the first year, we would repair it at our expense. A. would                 B. should                    C. could                 D. might 答案：B 解析: 略物质的化学式和相应的名称均正确的是 [     ]A.O3--氧气B.MgCl2--氯化镁C.O4Fe3--氧化铁D.Fe(OH)2--氢氧化铁