检查邻面龋的可靠方法为A．视诊 B．探诊 C．叩诊 D．温度测试 E．X线片检查

患者男性，48岁。因脸部长一疖肿和手指挤压后引起红肿面积扩大，并伴有发冷、寒战、体温39.5℃呼吸加快、头痛、恶心、呕吐、腹痛、关节痛、四肢及躯干出现皮疹。医生诊断为因挤压面部肿引起败血症。患者在入院前曾用杳霉素G钠肌注，病情无好转。平时病人有高血压，但血脂不高，每日服用卡托普利即可控制血压在正常范围。

提示：抗生素也有副作用，如使用不当，可引起一些不良后果。以下药物的不良反应与苯唑青霉素有关的是（）

A.个别人氨基转移酶升高

B.过敏性休克

C.有些患者出现药疹、药热、血管神经性水肿

D.可出现胃肠道反应，如恶心、呕吐、腹胀、腹泻、食欲不振等

E.偶见中性粒细胞减少

F.大剂量应用可出现神经系统反应，如抽搐、痉挛、神志不清、头痛等

2012年10月8日发布的修订版《机动车驾驶证申领和使用规定》，以其对违章驾驶员的严厉惩罚被人们称为“史上最严交规”，其中饮酒后驾驶机动车的一次记12分。利用如下测试管可检测司机是否酒后驾车，化学原理如下：

金属铬在化合物中主要有+3价和+6价两种价态。+6价铬化合物K₂CrO₄和K₂Cr₂O₇在水溶液中分别呈黄色和橙色，它们在溶液中存在如下平衡关系：2CrO₄^2-+2H⁺Cr₂O₇^2-+H₂O在酸性条件下+6价铬化合物具有强氧化性，可以将C₂H₅OH氧化为CH₃COOH，本身被还原为Cr³⁺，Cr³⁺在水溶液中呈灰绿色。

（1）根据上述条件可知，在强酸性条件下+6价铬主要以     （填“CrO^2-₄”或“Cr₂O^2-₇”）形式存在。如果司机酒后驾车，则测试管中的现象是   且超过法定警界线，反应的离子方程式为         。

（2）研究发现+6价铬的毒性为+3价铬的毒性的100～200倍，有多种方法可以将废水中的+6价铬转化为+3价铬以降低毒性。其中两种方法如下：

方法一：电化学方法。将含Cr₂O^2-₇的酸性废水加适量NaCl搅拌均匀并以Fe作电极进行电解。在阳极产生的Fe²⁺将Cr₂O^2-₇还原为Cr³⁺，在电解过程中溶液的pH不断上升，最终Cr³⁺和Fe³⁺以Cr（OH）₃和Fe（OH）₃沉淀的形式析出。

①请分析溶液pH不断上升的原因：                 。

②已知Fe³⁺和Cr³⁺变为Fe（OH）₃和Cr（OH）₃沉淀的pH如下表：

当溶液的pH范围为____时，溶液中Fe³⁺已沉淀完全而Cr³⁺还没有开始沉淀。

③当电路中通过3mol电子时，理论可还原Cr₂O^2-₇的物质的量为   mol。

方法二：还原沉淀法。将l0ml某含铬（Cr₂O^2-₇）废水用硫酸亚铁铵[FeSO₄·(NH₄)₂SO₄·6H₂O]处理，反应中铁元素和铬元素完全转化为沉淀，该沉淀经干燥后为nmolFeO·Fe_yCr_xO₃。

④不考虑处理过程中的实际损耗，下列叙述错误的是

A．反应中发生转移的电子个数为3nx

B．该废水中c（Cr₂O^2-₇）为50nx mol/L

C．消耗硫酸亚铁铵的物质的量为n（l+y）mol

D．在FeO·Fe_yCr_xO₃中，x+y=2

Talking behind someone’s back is considered to be rude and mean. Such a conversation can cover all kinds of criticism, from their looks to their work and personality.

The other day at lunch I was with a group of colleagues, and we were talking about our boss. She is the new headmaster of our middle school.

We talked about how kind she is to us. She handwrites notes to wish us happy holidays or to thank us for jobs well done. She checks on us when she knows we’re facing difficulties outside school with our health or with our families. We talked about the good role model that she is for the young women in our school and the fair but firm way she treats students and parents.

I thought about this after lunch. Sometimes we have the good fortune to be part of another kind of “talking behind someone’s back”. And too often when we say something good about someone behind their backs, they never know about it! That night, I sent her an email to report the conversation. She replied by saying how much she appreciated hearing about this, and how it made a bright spot in a tough week of testing.

Watch for your next opportunity to be the reporter! Make sure you tell them about the nice things said behind their backs! Because how will they know unless we tell them?

小题1:What do you conclude from the text the writer might be?

A．A student

B．A teacher

C．A parent

D．A boss小题2:What is the text mainly about?

A．Conversations about others

B．Rude and mean talking

C．Kinds of conversations

D．Talking behind someone’s back小题3:The author strongly agrees on _________.

A．Don’t talk behind others’ back

B．Talking behind others’ back is rude

C．Do tell the person about the nice things said behind his back

D．There is no one who never talks behind someone’s back

以下风险属于非系统风险的是（）。

A．政策风险 

B．周期波动风险 

C．利率风险 

D．财务风险

单一破产制是指（）

A.每一项破产只对一个当事人发生效力

B.每一项破产宣告只对同处于一个国家的当事人发生效力

C.一项破产只要在一国被宣告，即可将债务人的分散于各国的财产集中于统一的破产财团

D.只要采单一破产制，这种破产宣告的效力便得为其他国家都予承认