(A)

    Li Hong is a middle school student. She is a Young Pioneer. Liu Ying is in her class. She is a Young Pioneer, too. They go to school at seven every day. They don't go by bus. They have most of their classes in the morning. On Tuesday afternoon, they have two hours of sports. School is over at four in the afternoon. They do their homework at home. Sometimes they like to play football or watch TV after school.

    On Saturday afternoon they go to an old woman's house. She is about seventy. The two girls clean her room and carry water for her. They also buy things for her. They give the old woman a lot of help.

向CuO和铁粉的混合物中加入一定量的稀硫酸，微热，充分反应后冷却，过滤，在滤液中放入一枚洁净的铁钉，发现铁钉表面无任何变化，据此判断下列结论正确的是（　　）

江汉平原需要调出的主要农产品是（   ）

小敏班上准备组织一次登山活动，同学们都兴高采烈的．为了安全，老师拿出一张等高线地形图（如图）说：“这次我们要登的山较高，大家注意…”接着，强调了安全事项，顺便复习了等高线地形图的有关知识，要求同学们上山后留心观察这些地形区．此图中既没有经纬网也没有指向标，那么应该用（　　）方法定向．