观察下表（部分），下列选项中最适合作其标题的是（    ）

古地名	古治理地区	今地区
关内道	治西京京兆府	今陕西省西安市
河南道	治汴州	河南省开封市
江南西道	岳州巴陵郡	岳阳市
潭州	长沙郡	长沙市
灵州	灵武温池鸣沙等县	甘肃鸣沙

1mL 98%的浓硫酸（密度为1.84g•cm^﹣3）跟5mL水混合，所得稀硫酸溶液溶质的质量分数为____．

阅读理解

    There was a small river near Xue Yong's town．It went through several villages．The water was clean and there were lots of fish in it．

    Women would like to wash clothes along the river．It was a good place for them to talk about interesting things in their daily(日常的)life．Xue Yong liked eating noodles．So his mum often asked questions about how to cook noodles with different vegetables when she washed clothes there．

    It was also a good place for children．They caught fish and played water games there．At that time，Xue Yong had a small black dog．Every time he caught fish in the river,the dog followed(跟着)him．A fish was a good present for its work．

Now,Xue Yong lives in a city with his parents．

4.．They are interested in his town．Last Friday,Xue Yong and his parents watched a programme about some towns．Their town was one of them．

根据材料内容选择最佳答案。

如图所示，某小组同学用水、盐水、两种不同形状的容器和指针式压强计验证液体内部压强的规律，压强计指针顺时针偏转的角度越大，表示压强越大。乙、丙两图是探究液体压强与____的关系；要探究液体压强与盛液体的容器形状是否有关，____（选填“能”或“不能”）选择甲丁两图进行对比，理由是____。若在丙的容器内轻轻放入一木块，压强计指针偏转的角度将____（选填“变小”、“不变”或“变大”）

计算下面各题，能简算的要简算．

0.25× $\frac{4}{5}$ +2.5%

$\frac{7}{9}$ × $\frac{3}{4}$ +（ $\frac{5}{6}$ ﹣ $\frac{7}{12}$ ）

$\frac{3}{4}$ ×9.3+9.3×2.25

4.05﹣2.83﹣0.17．