Many people believe that hunger is only a problem in the developing world. ________, it is a problem all over the world. A. As a result B. On the contrary C. In addition D. For another 答案:B
日常中的下列做法,可用物质的化学性质解释的是( ) ①用汽油洗掉衣服上的油污 ②用纯碱除去面团因发酵产生的酸味 ③用大理石作装饰材料 ④家中熬骨汤时,加入少量食醋可以增加汤中的钙质 A.①② B.②④ C.①③④ D.②③④