试题与答案

(题共用题干)患儿,11岁,2周前出现右膝部间歇性疼痛和肿胀,拒按,休息后不缓解,且

题型:单项选择题

题目:

(题共用题干)患儿,11岁,2周前出现右膝部间歇性疼痛和肿胀,拒按,休息后不缓解,且逐渐出现轻度跛行,x线可见右股骨下段骨质破坏,溶骨和成骨改变并存,边界模糊,可见Codman三角,被高度怀疑患有骨肉瘤。

此时要告诉患儿及家长

A.用中药外敷肿胀部位

B.局部热敷和理疗

C.患处涂药油和刺激性药膏

D.疼痛时可用力按摩肿胀部位

E.减少患肢负重,避免剧烈运动

答案:

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参考答案:扫罗、大卫、所罗门

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题型:问答题

已知:CH3CH2OH+NaBr+H2SO4(浓)

CH3CH2Br+NaHSO4+H2O.

实验室制备溴乙烷(沸点为38.4℃)的装置和步骤如下:

①按如图所示连接仪器,检查装置的气密性,然后向U形管和大烧杯里加入冰水;

②在圆底烧瓶中加入10mL95%乙醇、28mL浓硫酸,然后加入研细的13g溴化钠和几粒碎瓷片;

③小火加热,使其充分反应.

试回答下列问题:

(1)反应时若温度过高可看到有红棕色气体产生,该气体的化学式为______.

(2)反应结束后,U形管中粗制的溴乙烷呈棕黄色.将U形管中的混合物倒入分液漏斗中,静置,待液体分层后,分液,取______(填“上层”或“下层”)液体.为了除去其中的杂质,可选择下列试剂中的______(填序号).

A.Na2SO3溶液         B.H2O         C.Na2CO3溶液      D.CCl4

(3)要进一步制得纯净的C2H5Br,可再用水洗,然后加入无水CaCl2干燥,再进行______(填操作名称).

(4)下列几项实验步骤,可用于检验溴乙烷中的溴元素,其正确的操作顺序是:取少量溴乙烷,然后______(填序号).

①加热   ②加入AgNO3溶液   ③加入稀HNO3酸化   ④加入NaOH溶液   ⑤冷却

请写出在此过程中,有溴乙烷参加的主要反应的化学方程式______.

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题型:阅读理解

阅读理解

     Giving an unwanted gift you received to someone else (regifting) is not considered as unacceptable

as in the past. Many Americans begin to regift and they think that regifting is okay most of the time. But

what should you avoid when regifting?

     First of all, a gift card hidden in a gift box can easily get passed along in error. Therefore, take the

card out of the old packaging, buy a new one and take a little extra time to make the packaging look

fresh and attractive.

     Secondly, people like to believe the gifts they receive are chosen with thought and consideration. If

you tell someone that the necklace you are giving is the one your aunt gave you last year, what you are

really saying is that you are giving them something you think is ugly or useless.

     Thirdly, there is a big difference between regifting an unused gift and one that you have used just for

a short time and decided you no longer want. Remember, a regift is a new thing. A hand-me-down is an

item you've used and offer to someone else when you decide you no longer use it.

     Most importantly, avoid giving a regift to friends who originally gave the gift to you. If the regift is

given, you risk getting caught for giving it away to the person who gave it to you.

     In a word, regifting is a wonderful way to save money and when it is done with thought, we can

achieve the goal of why we are giving a gift to someone in the first place - because we want them to have

something they will enjoy.

1. You are advised to give a new packaging to a gift mainly because       .

A. Americans like something new and attractive

B. it shows that the card has never been used

C. you can avoid giving the gift receiver wrong things.

D. it shows that the gift is chosen with thought

2. The worst thing happens when you       .

A. regift a hand-me-down item        

B. regift what you don't like

C. regift something wrapped in the original packaging

D. regift to the person who gave it to you

3. The main purpose of the writer is to tell us       .

A. it's common to regift in America

B. the things we should avoid when regifting

C. regifting can cause mistakes  

D. what are the proper things to regift

4. We can conclude from the text that the key to regifting is to       .

A. do it with thought

B. pay attention to what you say

C. save as much money as possible    

D. make the regift look new and attractive

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