问题 单项选择题

要推进党政机关领导干部及国有企事业单位领导人员职务()改革。

A.支出

B.消费

C.补贴

D.收入

答案

参考答案:B

阅读理解

Being organized is an important skill for school and life.When you're well organized, you can stay focused, instead of spending time hunting things down.__小题1:__For schoolwork, it means having one notebook or place where you store all your assignments, so you know what you have to do and when.Keeping labeled folders(贴有标签的文件夹) for handouts(课堂讲义)and keeping all your schoolwork neat and in a specific place—these are the main parts of organization.

For home stuff, being organized means having a place to put your things and putting them back as you go.__小题2:__It means keeping your schoolbag, your shoes, and your clean underwear in the same places so you always know where to find them.

Planning is part of being organized, too.__小题3:_ Calendars, lists, and schedules can help you plan.You can buy or draw a calendar and keep it near your workplace.Making a schedule or “to­do” list for yourself is a good idea.Looking at your list helps you keep track of what you need to do.__小题4:__ Check off things when you've done them.Use your list to help you decide which thing is most important to work on first.

__小题5:__But once you're organized, it feels great.The less time you spend hunting around for things or panicking about homework, the more time you have for better things, like reading a good book or playing.

A.Planning means deciding what you will do and when you will do it.

B.First, you should get your schoolwork organized.

C.Add new thi Check off things when you've done them.

D.You will benefit a lot from a good habit.E.What does it mean to be organized?

F.It takes some extra efforts to organize yourself and your stuff.

G.It means hanging your coat up instead of dropping it on the floor or throwing it on a chair.

问答题

硫酸渣是用黄铁矿制造硫酸过程中排出的废渣,主要化学成分为SiO2:约45%,Fe2O3:约40%,Al2O3:约10%,MgO:约5%.目前我国已经在技术上取得突破--用硫酸渣炼铁.

I.某学生探究性学习小组的同学设计了不同的方案,用化学基本知识进行金属元素的提取实验(已知25℃氢氧化镁Ksp=5.6×10-12;氢氧化铁Ksp=3.5×10-38;一水合氨电离常数K=1.8×10-5,其饱和溶液中c(OH-)约为1×10-3mol•L-1).

方案一:

请回答:

(1)写出固体E的化学式:______.

(2)试剂①是______

A.氢氧化钠    B.氧化铝      C.氨水    D.水

(3)若要准确测定溶液的pH是否达到3.7,下列物品中可供使用的是______

A.石蕊试液    B.广泛pH试纸  C.精密pH试纸  D.pH计

(4)溶液H中溶质的化学式:______

(5)要将固体C、固体E和固体G都转化为相应的稳定的氧化物,需进行的实验操作为______.

(6)若不考虑溶液体积的变化,请计算溶液H中c(Mg2+)=______.

方案二:

请回答:

(7)此方案的主要问题有:______

(8)写出由溶液M→固体乙这个过程中,最主要化学反应的离子方程式:______

II.为了分析某硫酸渣中铁元素的含量,先将硫酸渣预处理,把铁元素还原成Fe2+,再用KMnO4标准溶液在酸性条件下进行氧化还原滴定,反应的离子方程式是:5Fe2++MnO4-+8H+=5Fe3++Mn2++4H2O.

(1)判断到达滴定终点的现象是______.

(2)某同学称取2.000g硫酸渣,预处理后在容量瓶中配制成100mL溶液,移取25.00mL,试样溶液,用1.000×10-2mol•L-1KMnO4标准溶液滴定.达到滴定终点时,消耗标准溶液10.00mL,则残留物中铁元素的质量分数是______.