小蜂兰叶片正面呈绿色，背面呈紫红色，常用作盆栽观赏，某兴趣小组为探究气孔开闭与细胞吸水失水的关系进行了实验，结果如表（“﹣”表示不能发生，“+”表示能发生，“+”越多表示程度越大），请分析回答下列问题：

（1）选用小蜂兰下表皮作实验材料的优点是____ ，植物细胞原生质层的选择通透性取决于____ （结构名称）．

（2）将临时装片中的清水换成不同浓度的蔗糖溶液的正确操作方法是____ ．小蜂兰叶片下表皮细胞液渗透压与浓度在____ 之间的蔗糖溶液相当．

（3）图1为小蜂兰叶片的气孔结构示意图，中间两个呈肾形的细胞称为保卫细胞，它可调节气孔的开闭，该兴趣小组将小蜂兰叶片放在内部温度为15℃的密闭容器中，研究光频强度与光合作用速率的关系，结果如图2所示．

①A、B点时，保卫细胞中都能合成ATP的场所有____ ．图1所示箭头为炎热夏季中午时细胞中水分流动的总方向，此时、叶肉细胞中光合作用的____ 反应受到影响较大．

②据图2分析，在1klx的光频条件下，该叶片在5小时内光合作用产生的O₂量约为____ mL，影响A点上下移动的外界因素主要是____ 

    We sat on the swing (秋千) enjoying the fresh summer air. Cody, my 6-year-old brother laughed, because he could swing ____ (high) than me. I ____ (make) to smile by his laugh.

    After that, we went for a walk, looking at the garden. As we ____ (walk), Cody looked up at me and said, “Today is the best day for me”. I smiled at him ____ (happy) and answered, “Yes, it is a great day”. I then started thinking about what we did that day. We didn't do anything special. It was just ____ simple day. We went for walks and swung on the swing.

    So often, we wait ____ our “best days” without realizing that “today is our best day”. We often forget to enjoy ____ (live) the life today. We should be more like children ____ they truly live in the moment. They don't need expensive things to make ____ (they) happy.

    It's important for us ____ (remember) this and enjoy each da. You're your child-like heart of living each moment to its fullest.

填空。

how much、how many、how tall、how heavy