有一次考试，某班50名学生参加了，语文考试中及格的有40人，数学考试中及格的有25人

部分弱酸的电离平衡常数如下表：

弱酸	HCOOH	HCN	H2CO3
电离平衡常数(25℃)	Ki＝1.77×10－4	Ki＝4.9×10－10	Ki1＝4.3×10－7 Ki2＝5.6×10－11

 

下列选项错误的是（  ）

①2CN^－＋H₂O＋CO₂=2HCN＋CO₃^2-

②2HCOOH＋CO₃^2-=2HCOO^－＋H₂O＋CO₂↑

③中和等体积、等pH的HCOOH和HCN，消耗NaOH的量前者小于后者

④等体积、等浓度的HCOONa和NaCN溶液中所含离子总数前者小于后者

A.①②       B.②③       C.③④       D.①④

土基含水量大，排水不良，施工过程中未对路基（）进行处理，导致渠堤基础下沉等。

A、防渗

B、地面

C、排水

D、基础

John Steinbeck once said, “All Americans believe they are born fishermen. For a man to admit to a distaste in fishing would be like denouncing (公开指责) mother – love or hating moonlight.”

I can’t say that I’m the biggest John Steinbeck fan. Actually, the only thing I can ever remember reading by him was “The pearl” when I was in middle school, but I couldn’t agree more with the man when it comes to fishing. Whether I am on a boat in the middle of the Lay Lake, fishing off the shores of the Florida Keys for tarpon or catching rainbow trout in the Shoshone River of Wyoming, fishing is my life.

According to the American Sports Fishing Association, the fishing industry brings in more than $ 116 billion per year from fishermen across the country.

Though a beautiful picture to imagine, fishing is much more than that. Fishing is a way of life for many people and a way to escape everyday stress. Being a fisherman makes me a member of a wonderful group of people extending to all walks of life. Even President Obama can be found fishing on his farm in Texas with his good friend Roland Martin when the job gets too stressful.

I can remember fishing with my grandfather when I was 5 years old on his boat at Lake Mitchell. Although I didn’t understand what I was doing, I did know that my grandfather was happy and that made me happy. Since then I’ve spent the past 16 years on the rivers and lakes of Alabama.

After days of practice, before and after work, I slowly developed an understanding of fishing. My boss, Ric Horst, took me back to the Shoshone, and I managed to bring in a 19–inch cutthroat trout. Fishing with Ric was a life–changing experience for me. He not only showed me how to fish correctly, but also told me how fishing could be a way to escape your problems.

Since then, prime–time season seems to take forever to arrive.

Now, with the ending of February and beginning of March in sight, the excitement of heading out Lake Tuscaloosa or Lake Lurleen before classes and catching something has finally returned.

小题1:What John Steinbeck said in the first paragraph implies that ______________.

A．Americans are believed to be the offspring of fishermen

B．it is unthinkable for an American to admit his dislike of fishing

C．all Americans are expert at fishing

D．those who dislike fishing would not love their mother小题2:．The writer came to understand the real meaning of fishing ______________.

A．when he was reading “The pearl” by John Steinbeck

B．when he went fishing with his grandfather at Lake Mitchell

C．after he had spent 16 years on the rivers and lakes of Alabama

D．after he went fishing with his boss, Ric Horst on the Shoshone小题3:What can be inferred from the text?

A．The author is at most 21 years old.

B．The author regards fishing as a very important part in his life.

C．The author agreed with John Steinbeck the most when he was in middle school.

D．President Obama often goes fishing in public in order to collect idea for his job.小题4:．According to the author, __________________.

A．people can get to know VIPs when fishing.

B．people can smooth away all the troubles by fishing

C．Fishing is a way of communication

D．Fishing is a way to make a living for most American people小题5:．What is the purpose of the writing?

A．To describe the writer’s experience and understanding of fishing.

B．To explain the reason why so many Americans like fishing.

C．To make others understand the industry of fishing.

D．To express his opinions about fishing in different time of the year.

（16分）大气中的部分碘源于O₃对海水中I^－的氧化。将O₃持续通入NaI溶液中进行模拟研究。

（1）O₃将I^－氧化成I₂的过程由3步反应组成：

①I^－(aq)+ O₃(g)==IO^－(aq)+O₂(g)              △H₁

②IO^－(aq)+H⁺(aq)HOI(aq)   △H₂

③HOI(aq)+ I^－(aq)+ H⁺(aq)I₂(aq)+H₂O(l)    △H₃

总反应的化学方程式为______，其反应△H=______。

（2）在溶液中存在化学平衡：I₂(aq)+I^－(aq)I₃^－(aq)，其平衡常数表达式为_______。

（3）为探究Fe²⁺对氧化I^－反应的影响（反应体系如图13），某研究小组测定两组实验中I₃^－浓度和体系pH，结果见图14和下表。

  

编号	反应物	反应前pH	反应后pH
第1组	O3+ I－	5.2	11.0
第2组	O3+ I－+ Fe2+	5.2	4.1

①第1组实验中，导致反应后pH升高的原因是_______。

②图13中的A为           。由Fe³⁺生成A的过程能显著提高I^－的转化率，原因是_______。

③第2组实验进行18s后，I₃^－下降。导致下降的直接原因有（双选）______。

A．c(H⁺)减小     B．c(I^－)减小     C．I₂(g)不断生成      D．c(Fe³⁺)增加

（4）据图14，计算3～18s内第2组实验中生成I₃^－的平均反应速率（写出计算过程，结果保留两位有效数字）。

关于安全生产许可证的说法，错误的是（）。

A．没有取得施工许可证的不得颁发安全生产许可证

B．未取得安全生产许可证的企业，不得从事建筑施工活动

C．建设主管部门在颁发施工许可证时，应当对已经确定的建筑施工企业是否有安全生产许可证进行审查

D．企业取得安全生产许可证后，不得降低安全生产条件