表是“馒头在口腔中的变化”探究实验步骤请根据此表回答问题． _爱下问搜题

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问题解答题

表是“馒头在口腔中的变化”探究实验步骤请根据此表回答问题．

试管编号	1	2	3
加入的物质	馒头碎屑+2毫升唾液	馒头碎屑+2毫升清水	馒头+2毫升唾液
搅拌	充分搅拌	充分搅拌	不搅拌
保温	37摄氏度水浴10min	37摄氏度水浴10min	37摄氏度水浴10min
加入碘液	2滴	2滴	2滴

（1）该实验探究的问题是______？

（2）若1和2为一组，则实验的变量是______，______号试管为实验组．

（3）为了证明“牙齿的咀嚼”对馒头有消化作用，应选用______（填试管标号）两支试管进行对照试验．

（4）加入碘液后变蓝的是______号试管，淀粉被分解了加碘液不变蓝的是______号试管，原因是______．除口腔外，淀粉的消化还可以在人体的______内进行．

（5）实验结论：馒头变甜与______、______以及______的分泌都有关系．

答案

（1）根据题干可知该实验探究的问题是馒头在口腔里的变化？

（2）1号试管中加入的是唾液，2号试管中加入的是清水，则实验的变量是唾液，对照组是1号试管，经过变量处理的是实验组，因此2号是实验组．

（3）若要探究牙齿的咀嚼和舌的搅拌对淀粉的消化作用，应以牙齿的咀嚼为变量设置对照实验，即表中1号试管与3号试管形成了以牙齿的咀嚼为变量的对照实验，该组实验的结果表明牙齿的咀嚼有助于淀粉的消化．

（4）2号试管中加入的是清水，清水中没有唾液淀粉酶，淀粉没有变化，因此滴加碘液后变蓝色．3号试管没有搅拌，淀粉没有变化，因此滴加碘液后变蓝色．淀粉遇碘变蓝色，麦芽糖遇碘不会变蓝．唾液中含有唾液淀粉酶，1号试管在条件适宜的情况下能将淀粉分解为麦芽糖，因此1号试管滴加碘液不变蓝．淀粉在小肠里被消化为葡萄糖．

故答案为：（1）馒头在口腔里的变化（2）唾液；2 （3）1、3 （4）2、3；1；淀粉被分解了（5）牙齿的咀嚼；舌的搅拌；唾液

填空题

Stress is our response to threatening or (1) events. We may experience different levels of stress depending on the (2) , meaning the events or circumstances that cause us to feel stress. Stressors can be classified into (3) main categories: (4) events, personal stressors, and (5) stressors. Cataclysmic events are major events that cause stress (6) , immediately, for a great many people at once. Personal stressors are major life events that create stress, including (7) life events. Background stressors are (8) hassles, or minor irritations, or (9) background stressors. Repeated exposure to stressors has both psychological and (10) consequences. The long- term consequence is that body tissues such as the heart and blood vessels can begin to (11) . The (12) system functions less effectively, and (13) our ability to fight off illnesses.
The General Adaptation (14) explains the sequence of physiological reactions to stress. There are three phases to G. A. S. The first is the " alarm and (15) " phase: we respond with alarm, and take (16) to remove the stressor. The second phase is the (17) stage: we fight against the stressor or try to cope with the stressor. This can lead to the third phase. (18) . The exhaustion phase may be an (19) way of trying to avoid the stressors. The body may be telling us that we need to do whatever is (20) to remove the stressor.

Stress is our response to threatening or (1) events. We may experience different levels of stress depending on the (2) , meaning the events or circumstances that cause us to feel stress. Stressors can be classified into (3) main categories: (4) events, personal stressors, and (5) stressors. Cataclysmic events are major events that cause stress (6) , immediately, for a great many people at once. Personal stressors are major life events that create stress, including (7) life events. Background stressors are (8) hassles, or minor irritations, or (9) background stressors. Repeated exposure to stressors has both psychological and (10) consequences. The long- term consequence is that body tissues such as the heart and blood vessels can begin to (11) . The (12) system functions less effectively, and (13) our ability to fight off illnesses.
The General Adaptation (14) explains the sequence of physiological reactions to stress. There are three phases to G. A. S. The first is the " alarm and (15) " phase: we respond with alarm, and take (16) to remove the stressor. The second phase is the (17) stage: we fight against the stressor or try to cope with the stressor. This can lead to the third phase. (18) . The exhaustion phase may be an (19) way of trying to avoid the stressors. The body may be telling us that we need to do whatever is (20) to remove the stressor.

判断题

用改变库存水平的策略处理非均匀需求，对劳务性生产也适用。