单选题：下列说法错误的是（ ）A乙烷室温下能与浓盐酸发生取代反应B乙烯可以用作生产食品包装材料的原料C乙醇室温下在水中的溶解度大于溴乙烷D乙酸与甲酸甲酯互为同分异构体

下列有关纯铁的描述正确的是（ ） A熔点比生铁的低B与相同浓度的盐酸反应生成氢气的速率比生铁的快C在潮湿空气中比生铁容易被腐蚀D在冷的浓硫酸中可钝化

The back garden of our house contains a lawn, ______ very pleasant to sit on in summer.Awhich isBwhich it is Cit isDwher

The 1982 oil and gas act gives power to permit the disposal of assets held by the corporation, and ___ the corporation's

Which is the main idea of the passage?ACollection and collectors. BThe evolution of museums.CModern museums and their fu

简述指导学生形成有效的学习策略。