题目

Henry is very fat.He can’t walk fast for a long time and he often feels tired. He wants______,so he eats very______.He eats little______because it will_____him fat.He does______every morning.He often goes to______and runs in the afternoon.Now be is thinner than before.Henry’s cousin,Susan,is healthier______him.She takes care of_____,She____a lot of exercise every week,and keeps in good_____.【小题1】A. thin B. to thin C. to get thin D. to get fat【小题2】A. many B. much C. few D. little【小题3】A. water B. fruit C. sugar D. vegetables【小题4】A. be B. make C. give D. bring某初中生物研究性学习小组的同学，在探究“馒头在口腔中的变化”课题时，准备了馒头（碎屑与小块等量）、唾液、清水、碘液、恒温箱等实验设备和材料。设计了如下实验方案：试管编号馒头形态加入的物质温度环境实验现象1碎屑2毫升唾液和2滴碘液37℃10分钟2碎屑2毫升清水和2滴碘液37℃10分钟3小块2毫升唾液和2滴碘液37℃10分钟4碎屑_____，2滴碘液0℃10分钟请分析回答下列问题。（1）分析1号试管和2号试管这一组实验，实验变量是_____。预测实验现象，会变蓝的是_____号试管。通过该组实验，得出的结论是_____。（2）分析1号～3号试管，能与3号试管形成对照实验的是_____号试管。3号试管的实验现象是_____。（3）研究性学习小组的同学在上述实验方案的基础上，想进一步探究“其它因素对唾液淀粉酶消化作用的影响”，补加了4号试管。请你根据所学的有关知识判断，加入到4号试管的物质还应该有_____，对照实验是_____号试管，4号试管的实验现象是_____，实验结论是_____。