已知函数 $f\left(x\right)=\frac{1-x}{ax}+\ln x$ 在（1，+∞）上是增函数，且a＞0．

（Ⅰ）求a的取值范围；

（Ⅱ）求函数g（x）=ln（1+x）﹣x在0，+∞）上的最大值；

（Ⅲ）已知a＞1，b＞0，证明： $\frac{1}{a+b}\le \ln \frac{a+b}{b}<\frac{a}{b}$ ．

在含氯化钠杂质的纯碱样品12.4g中逐渐加入质量分数为7.3%稀盐酸，所加稀盐酸的质量与溶液的pH值的关系如图所示，计算：

The company wants to _________ a school for the poor children.

二次函数y=kx²-6x+3y的图象与轴有交点，则k的取值范围是（   ）

It's raining. Ann meets Little Water Drop. She's talking with him.

Ann: Hi, where do you come from, Little Water Drop?

Little Water Drop: I come from the sea.

Ann: Oh，that's far from here.

Little Water Drop: Yes. I come here in a cloud. I fly over rivers and mountains.

Ann: Now you fall down here. How do you go back to the sky?

Little Water Drop: The sun shines and shines. I get hot. Then I go up to the sky. It's cool there. I am in a cloud.

Ann: Do you feel happy?

Little Water Drop: Yes, I do. I can help people. I am useful. People use water to wash clothes and vegetables, cook food, wash clothes, make drinks and so on. Farmers use water to grow crops and firemen use water to put out fires.