下列实验方法或操作正确的是（　　）

    Mr. White lives in the countryside with his wife, Mrs. White. From Monday to Friday he works in a small office near his house. He is free on Saturdays and Sundays. He has a nice garden near his house. He likes growing flowers and he usually works in the garden on Saturdays and Sundays. The flowers are colourful and beautiful. Mrs. White likes them very much. She often helps Mr. White. They live happily together.

写作。

       以“那段       的日子”为题（请你从“温暖”“自由”“孤单”“烦心”四个词语中选择一个，把题目补充完整），写一篇文章。　

为探究绿色植物的生理活动，某兴趣小组设计并完成了以下实验步骤：

a．按如图连接好实验装置，关闭阀门①和②后放到黑暗处一昼夜．

b．将整个装置移到适宜的阳光下照射数小时（光照前阻断叶片间的有机物的运输）．

c．打开阀门①，将透明塑料袋中的气体通入甲试管，待气体收集满后，打开橡皮塞，用带火星的木条检测．

d．打开阀门②，将黑色塑料袋中的气体通入乙试管进行检测．

e．取下叶片A、B，用酒精脱色处理，漂洗叶片后滴加碘液，观察颜色变化．

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