据新华网报道，曾被称为“滇中粮仓”的昆明市宜良县北古城镇，提出了“城镇工业上山，优质农田下山”的发展模式。据此回答下列问题。小题1:该镇提出“城镇工业上山”的主要目的是
A．山区环境优美，空气洁净
B．山上地势高，不易受洪水威胁
C．促进产业结构升级，提高城市化水平
D．减少占用耕地面积，守住耕地红线小题2:该发展模式产生的不利影响可能有
①引发土壤次生盐碱化；②地质灾害增加；③建设成本增加；④城镇工业可用土地减少；⑤山区水污染加剧
A．①②⑤
B．②③⑤
C．②④⑤
D．①③④
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完形填空（共20小题；每小题1.5分，满分30分） 阅读下面短文，掌握其大意，从短文后所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑
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下列关于抗体的说法，正确的是
[ ]
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