问题 单项选择题

有机磷杀虫药中度中毒时,患者的胆碱酯酶活力一般为正常人的______

A.80%以上
B.70%~50%
C.50%~30%
D.30%以下

答案

参考答案:C

解析:本题主要考查的知识点是有机磷杀虫药中度中毒的症状。
有机磷杀虫药中度中毒者除有头晕、头痛、恶心、呕吐、多汗、流涎、瞳孔缩小等症状外,还出现肌纤维颤动、轻度呼吸困难、大汗、腹痛、腹泻,意识清楚或轻度障碍。全血胆碱酯酶活力降至50%~30%。

单项选择题

Social-networking sites offer users easy ways to present idealized images of themselves, even if those ideals don’t always square with their real-world personalities. Psychology researcher Soraya Mehdizadeh has discovered a way to poke through the offline-online curtain: she has used Faeebook to predict a person’s level of narcissism and self-esteem.

Mehdizadeh, who conducted the study as an undergraduate at Toronto’s York University, gained access to the Faeebook accounts of 100 college students and measured activities like photo sharing, wall postings and status updates; she also studied how frequently users logged on and how often they remained online during each session. Her findings were published recently in Cyberpsyehology, Behavior and Social Networking.

After measuring each subject using the Narcissism Personality Inventory and Rosenberg Self-Esteem Scale, Mehdizadeh, who graduated from York this past spring, discovered narcissists and people with lower self-esteem were more likely to spend more than an hour a day on Facebook and were more prone to post self-promo-tional photos ( striking a pose or using Photoshop, for example). Narcissists were also more likely to showcase themselves through status updates (using phrases like "I’m so glamorous I bleed glitter") and wall activity (posting self-serving links like " My Celebrity Look-alikes" ).

Self-esteem and narcissism are often interrelated but don’t always go hand in hand. Some psychologists believe that narcissists--those who have a pervasive pattern of grandiosity, a need for admiration, as well as a lack of sympathy--unconsciously inflate their sense of self-importance as a defense against feeling inadequate. Not enough empirical research has been produced to confirm that link, although Mehdizadeh’s study seems to support it. Because narcissists have less capacity to sustain intimate or long-term relationships, Mehdizadeh thinks that they would be more drawn to the online world of virtual friends and emotionally detached communication.

Although it seems that Facebook can be used by narcissists to fuel their inflated egos, Mehdizadeh stops short of proclaiming that excessive time spent on Faeebook can turn regular users into narcissists. She also notes that social-networking sites might ultimately be found to have positive effects when used by people with low self-esteem or depression. "If individuals with lower self-esteem are more prone to using Facebook," she says, "the question becomes, ’ Can Facebook help raise self- esteem by allowing patients to talk to each other and help each other in a socially interactive environment’ I don’t think it’s necessarily a bad thing that people with low self-esteem use Facebook.

According to the views of psychologists (Para 4, line 2), narcissists would()

A. make themselves feel adequate

B. show their differences

C. obtain the respect of others

D. defense against feeling insufficient

问答题

⑴实验室中,我们通常使用下面三种方法来制取氧气;

2H2O22H2O+O2

2KClO32KCl+3O2

2KMnO4K2MnO4+MnO2+O2

下图是气体制备时的常用装置:

根据你对上述内容的理解,回答下列问题:

①装置C的名称是        

②一般采用双氧水制取氧气的理由是           

③采用高锰酸钾制氧气选用的发生装置是           

④采用氯酸钾制得的氧气有刺激性气味,是因为氯酸钾分解时会产生少量的氯气。可利用         (填序号)装置,并向其中加入        溶液除去;

⑤三种制氧方法中都出现二氧化锰,他们的作用有何不同?                

信息提供:

氯气有毒,会对上呼吸道黏膜造成伤害,症状严重时会致人死亡,少量氯气可通过碱溶液除去。

⑵苏打水是碳酸氢钠(NaHCO3)的水溶液,有弱碱性。医学上外用可消毒杀菌,饮用可改变酸性体质,保持人体内的酸碱平衡。下图是某品牌苏打水的图片和配料表,读图完成下面问题:

①根据配料表可以发现:苏打水成分中的无机物有          ,有机物有            (每空至少填写两种物质);

②请你设计实验证明该品牌苏打水含有碳酸氢钠:

实验步骤实验现象实验结论及化学反应方程式