下列哪种疾病可出现肺血减少的X线征象是（） A.室间隔缺损 B.风湿性心脏病二尖瓣狭

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.

Narcissists may（）

A. be online for a long time

B. only upload the photos of their own

C. own the p sympathy

D. be self-serving

（4分）生活离不开化学，化学与生活息息相关。

（1）下列食物主要为人体提供糖类的是              （填序号）。

A．蔬菜          B．花生           C．大米

（2）下列生活制品所使用的材料中，不属于有机合成材料的是            （填序号）。

A.纯棉毛巾         B.塑料脸盆          C.合成橡胶鞋底        D.尼龙背包

（3）农村大力推广使用沼气（主要成分为甲烷）燃烧发电，该反应的化学方程式为    。

（4）煤作为燃料给人类提供能量的同时会生成一些对环境造成污染的物质，其中会形成酸雨的气体是           （填序号）。

A. CO₂       B.CO        C. SO₂        D. NO₂

截止2008年7月31日，中国红十字基金会累计收到货币资金捐款1280477122.53元，用科学记数法表示为（结果保留3位有效数字）（    ）。

布置施工总平面图时，应优先考虑的是（）。

A.搅拌站、加工厂

B.场外交通道路

C.内部运输道路

D.临时设施

血瘀局部会出现（）

A.肿胀

B.胀闷

C.疼痛

D.四肢厥冷

E.血肉腐败