A．斜面的机械效率可能与物体的重力有关．

B．斜面的机械效率可能与斜面的倾斜程度有关．

小华同学为了证实自己的猜想是否正确，于是他用同一块木板组成如图所示的装置进行了实验探究，记录的实验数据如下表：

阅读下面的材料：

如果函数y=f（x）满足：对于自变量x的取值范围内的任意x₁，x₂，

①   若x₁＜x₂，都有f（x₁）＜f（x₂），则称f（x）是增函数；

②若x₁＜x₂，都有f（x₁）＞f（x₂），则称f（x）是减函数．

例题：证明函数f（x）= $\frac{2}{x}$ （x＞0）是减函数．

证明：假设x₁＜x₂，且x₁＞0，x₂＞0

f（x₁）﹣f（x₂）= $\frac{2}{x_1}$ ﹣ $\frac{2}{x_2}$ = $\frac{2x_2-2x_1}{x_1{x}_2}$ = $\frac{2\left(x_2-x_1\right)}{x_1{x}_2}$

∵x₁＜x₂，且x₁＞0，x₂＞0

∴x₂﹣x₁＞0，x₁x₂＞0

∴ $\frac{2\left(x_2-x_1\right)}{x_1{x}_2}$ ＞0，即f（x₁）﹣f（x₂）＞0

∴f（x₁）＞f（x₂）

∴函数f（x）= $\frac{2}{x}$ （x＞0）是减函数．

根据以上材料，解答下面的问题：

根据短文内容，请将单词填写在题号对应的横线上。

    When we plant a rose seed in the earth,we notice it is small,but we do not criticize it as "rootlees and stemless".We treat it as a seed, ____ （give）it the water and nourishment required ____ a seed.

    When it first ____ （shoot up）out of the earth, we don't condemn（指责）it as ____ （mature） and underdeveloped, ____ do we criticize the buds for not being open when they appear. We stand in wonder at the process ____ （take） place, and give the plant the care it needs at each stage of its development.

    The rose is a rose from the time it is a seed to the time it dies.Within it,at all times,it contains its whole potential. It seems to be ____ （constant） in the process of change: Yet at each state， at each moment, it is perfectly all right as ____ it is.

    A flower is not ____ （good）when it blooms than when it is merely a bud; at each stage it is ____ same thing---a flower in the process of expressing its potential.