第二节My dad tapped me gently on the shoulder, and we went inside. Sitting back to ourCornish chicken, Dad, smilingly, updated me on recent events at his work without a mere mentionof the crazy dough wildly dancing outside, which served wonderfully as a gentle embarrassmentreliever. However, while doing the dishes after dinner dad said to me with firmness in his voiceYou don' t have to be an expert to make bread, but you do have to do your research before takingactions. There is no such thing as an easy way out. And that was the starting point of my journeywith making the perfect breadAt a party three months later, everyone wanted to try my bread. The rest of the nightslipped away, filled with inquiries about my secret recipe. Yet, hardly was there a different answerother than, Beauty comes from balance and patience to be frank, that was exactly what I'dlearnt during my numerous experiments. An amazing loaf of bread required suitable balance ofingredients to mix as well as enormous patience of waiting for the dough to rise. Countless weremy failures to make tasty bread, every single moment of it was cherished. Along the journey, Ivedeveloped from the man whose dough sighs in a dustbin to the man whose bread makes your tastebut dance

4.【解析】本实验采用质壁分离的原理探究黑藻叶片细胞液的浓度.实验的自变量是蔗糖溶液的浓度,因变量是蓝色小滴升降情况;根据实验数据分析,黑藻叶片细胞的细胞液浓度介于0.15mo·L-和0.20mol·L-1之间;乙组试管1、2、3中蓝色小滴下降的原因是甲组12、3号试管中黑藻叶片的细胞液浓度大于蔗糖溶液浓度、细胞吸水,导致试管中蔗糖溶液浓度上升,蓝色小漓密度大于乙组相同编号试管內溶液的密度,由于甲组3号试管失水少,蔗糖溶液浓度变化小.故乙组3号试管中蓝色小滴下降速率最慢;乙组试管4、5、6屮藍色小滴均上升的原因是甲组4、5、6试管中黑藻叶片的细胞液浓度小于蔗糖溶液浓度.细胞失水,导致试管中蔗糖溶液浓度下降,蓝色小滴密度小于乙组相同编号试管内溶液的密度.甲组6号试管细胞失水最多,故6号试管中黑藻叶片细胞内叶绿体分布最密集。故选D。

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