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问题 单项选择题

IgE抗体介导的变态反应是

A．Ⅰ型变态反应
B．Ⅱ型变态反应
C．Ⅲ型变态反应
D．Ⅳ型变态反应
E．Ⅴ型变态反应

答案

参考答案：A

解析：Ⅰ型过敏反应主要由血清中IgE介导。特异性IgE可经Fc段与肥大细胞的FcR结合，使机体处于致敏状态，当再与相应变应原结合，即可引发Ⅰ型变态反应。

阅读理解
信息匹配(共5小题, 每小题2分, 满分10分)
阅读下列应用文及相关信息，并按照要求匹配信息。请在答题卡上将对应题号的相应选项字母涂黑。
以下是几则急救课程的信息：
Course Name
Course Format
School
/Trainer
Training Centers
Course Aim
A. CPR First Aid
Classroom
Lewis College
of Business
Detroit,
United States
To prepare students to triage and handle a variety of emergencies from minor ones to the most serious beginning with techniques needed to chart what occurred.
B. First Aid in the workplace
E-learning
Digital Think
San Francisco U.S.A
To empower you with the knowledge and skills necessary to provide basic first aid care in both emergency and non-emergency medical situations in the workplace
C. STCW95 Basic Safety
Blended
Flagship Superyacht Academy
Portsmouth U.K
A 5-day course essential for basic fire fighting training
D. Emergency Life Support and Basic First Aid for speakers of other languages
Classroom
City Lit
London, United Kingdom
To recognize and deal with a number of life-threatening first aid incidents and offer support in developing the use of the English language
E. Activity First Aid
On-site
City Lit
London, U. K.
To deal with a whole range of injuries. Leads to a practical examination. This course continues from the basic first aid course and will deal with further type.
F. First Aid Intensive Lifesaver & LS Plus
Classroom
City Lit
London U.K.
Starting with important basic first aid skills, such as resuscitation and dealing with unconscious occurrences.
请阅读下面欲参加课程者的个人资料，然后匹配与其适应的急救课程：
小题1:  John, whose house caught fire one night and was destroyed, was lucky enough to survive after months of treatment in the hospital. He became a homeless orphan and he could never forget the terrible disaster. He wants to learn the first aid so that his misfortune won’t happen to others.
小题2: Jane works in a large international company, which is on the top floor in a skyscraper in New York. She thinks it’s not so easy for them to get to safety if emergency happens while working.
小题3: Zhang Ying, a Chinese girl who is studying in London, is curious about learning some basic first aid skills and improving her English.
小题4: Li Jian is a student of senior Ⅱ and has experienced some accidents. He wants to learn how to deal with not only the simple injuries but also serious ones. He doesn’t want to just sit in the classroom, listening and watching.
小题5: Wang Yang’s mother is weak in health and often gets tired easily. She even loses her consciousness from time to time. Wang Yang is so worried about her that she wants to learn some first aid to help her mother in case of such situations.
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问答题

有一包白色固体粉末，其中可能含有KCl、BaCl2、Cu（NO3）2、K2CO3中的一种或几种，现做以下实验：

①将部分粉末加入水中，振荡，有白色沉淀生成，过滤，溶液呈无色：

②向①的沉淀物中加入足量稀硝酸，固体完全溶解，并有气泡产生；

③取少量②的溶液，滴入稀硫酸，有白色沉淀产生；

④另取①中过滤后的溶液加入足量AgNO3溶液，产生白色沉淀．

试根据上述实验事实，回答下列问题：

（1）写出原白色粉末中一定含有的物质的化学式______

（2）写出原白色粉末中一定不含有的物质的电离方程式______

（3）写出下列各步变化的离子方程式：

②______

④______．
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