题目

Dust storms appear when strong wind blows sand and dirt from a dry surface. Strong dust storms can cause injuries and deaths, so ifs necessary to know what to do when you come across them.Be careful of dust storm warnings.Dust storms are most likely to happen on hot summer days, so listen to the local TV or radio before traveling in hot, dry conditions, and consider changing or giving up your trip if dust storms are predicted (预测). Roadside signs may also be able to warn you of dust storm danger.Be prepared.If you are in an area where storms happen often, carry a mask to keep out dust and H++OH-=H2O表示下列哪个离子反应（）。A.Cu（OH）2与H2SO4 B.Ba（OH）2与H2SO4C.Al（OH）3与HClD.KHSO4与KOH