图片与单词配对

 mother    morning  mouth   read     draw     rubber

 ____   ____  ____ ____   ____ ____

设f（x）在x=x₀处可导，且$\underset{△x\to 0}{\lim }\frac{f\left(x_0+3△x\right)-f\left(x_0\right)}{△x}=1$，则f′（x₀）等于（　　）

    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.

下图为某学习小组制作洋葱鳞片叶表皮细胞临时装片时的方法步骤图。请分析回答：

(1)请你把正确的实验操作顺序补充完整：C→____ （用序号和箭头表示）。
(2)步骤C中，滴加的液体是____ 。
(3)步骤D中，撕取的是洋葱鳞片叶的____ 表皮。
(4)将某同学认真制作的玻片置于显微镜下观察，发现视野中有这样几个结构：边缘很黑、较宽，里面为空白的圆形或椭圆形，用镊子轻压盖玻片会移动和变形，这个结构一定是____ 。它的产生可能是步骤____ （填序号）操作不规范引起的。