问题 单项选择题

24岁,妊娠38周,头位临产14h,破水2h,羊水清,胎心140次/分,胎儿估计3000g,宫缩30s/5min。 * * 检查:宫口开大8cm,无水肿,胎头降至+1,小囟门位于4点处,儿头颅骨无重叠,1h后宫口开大无进展。此时正确的处理是()

A.等待自然分娩

B.即行剖宫产术

C.胎头吸引器助产

D.待宫口开全后产钳助产

E.催产素静脉点滴加速产程

答案

参考答案:E

实验题

NaCl和NaClO在酸性条件下可发生反应:ClO+Cl+2H+ = Cl2↑+H2O,某学习小组拟研究消毒液(主要成分为NaCl和NaClO)的变质情况。

(1)此消毒液中NaClO可吸收空气中的CO2生成NaHCO3和HClO而变质。写出化学反应方程式                                                                 

(2)取适量消毒液放在试管中,加入足量一定浓度的硫酸,有气体放出。通过以下装置检验气体的成分可以判断消毒液是否变质。

限选试剂:98%浓硫酸、1%品红溶液、1.0 mol·L1 KI-淀粉溶液、1.0 mol·L1NaOH、澄清石灰水、饱和NaCl溶液

请完成下列实验方案。

   所加试剂           预期现象和结论
试管A中加足量①          

试管B中加1%品红溶液;

试管C中加②              

若A中溶液变蓝色,B中溶液不退色,C中溶液变浑浊。则消毒液部分变质;

                          则消毒液未变质;

                        则消毒液完全变质。

 

(3)用滴定法测定消毒液中NaClO的浓度。实验步骤如下:

①量取 25.00mL消毒液放入锥形瓶中,加入过量的a mol·L1 Na2SO3溶液b mL;

②滴定分析。将c mol·L1的酸性KMnO4溶液装入           (填酸式或碱式)滴定管中;KMnO4和剩余的Na2SO3发生反应。当溶液由无色变成浅红色,且保持半分钟内红色不退时,停止滴定,记录数据。重复滴定实验2次,平均消耗酸性KMnO4溶液v mL;

滴定过程中涉及的反应有:NaClO + Na2SO3 = NaCl+ Na2SO4

2KMnO4 + 5Na2SO3+ 3H2SO4 = K2SO4 + 2MnSO4 + 5Na2SO4 + 3H2O

③计算。消毒液中NaClO的浓度为        mol·L1(用含a、b、c、v的代数式表示)。

阅读理解

My mother-in-law, Dorothy, is showing me the red notebook that’s almost as precious to her as my husband’s baby pictures. Inside the notebook is a list of the books she has read since 2007. For some people waking up in the middle of the night is a terrible thing. But for my mother-in-law, that time is a gift. At 87, she is getting the education she never had by working her way through great literature. She has now read close to 100 books, including every single novel by Anthony Trollope, Charles Dickens, Jane Austen, Edith Wharton, Henry James and Thomas Mann.

My mother-in-law discusses her passion with the enthusiasm of a young girl, although she can also be a very tough critic, writing “VG’ for “ very good” in the margins next to her favorites. So far, only a handful of books have received the top prize.

Born in Ridgefield, Conn, Dorothy was the youngest daughter of an Italian gardener. She taught herself English by reading The New York Times. Eager to come to Manhattan, she became a nurse, married a dentist and spent the next several decades keeping the house and raising a family. In her later years, she put her nursing skills to good use by taking care of my father-in-law, who had lung cancer. There were many trips to the emergency room in the middle of the night and then a long hospital stay. She stayed awake to watch over him for 15 hours a day. Always a light sleeper, she developed sleeplessness as a result of the stress.

It worsened after he died. Deeply sad and lonely for the first time in her life, she began waking up around 2am. Julian and Sylvia, the elderly couple next door suggest she read literature. And so Julian, a great lover of literature, became her “professor”, providing books from his large library. Suddenly the terrifying hole turned onto a world of amazing characters.

小题1:Why is Dorothy considered a tough critic?

A.Because no books are inspiring enough in her eyes.

B.Because only a few books are thought highly of by her.

C.Because she only reads books by famous writers.

D.Because she finds fault with every book she reads.小题2: It can be inferred from the passage that _____.

A.the books Dorothy has read were bought by her husband.

B.the couple next door are college professors.

C.the author loves literature too.

D.Dorothy was a great wife.小题3:The underlined part “the terrifying hole” in the last paragraph refers to _____.

A.the frightening death

B.Dorothy’s lack of education

C.waking up in the middle of the night

D.a hole in a book that Dorothy read小题4: What helped Dorothy get over the sadness and loneliness of losing her husband?

A.Living with her son.

B.Reading literature.

C.Seeing her son’s baby pictures.

D.Talking with neighbors.