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　　Across the world, students are sweating as they prepare for all kinds of exams．Many teenagers complain that while they do well in their homework, they don't get 　　1　　 marks in exams．They are wondering why．

　　In a new study U．S．psychologists think they have found the answer．Researchers report that heavy exam 　　2　　 is actually more likely to affect the performance of very good students than average ones．

　　Worried about 　　3　　 others, these students can lose their most valuable 　　4　　 weapons：short-term or working memory．This is their ability to 　　5　　 numbers and ideas, while focusing on problem at hand．According to the study, when 　　6　　 pressure is put on people with good skills, their performance drops．

　　People with strong working memory skills 　　7　　 to do well in intellectual ability test．Their analytical skills and creative 　　8　　 depend on their short-term-focused processor．

　　In the study, researchers 　　9　　 the working memory of 93 students．They were divided into two groups, with a high and a low 　　10　　 memory．

　　The students then took two maths tests each under 　　11　　 conditions．One was called a practice test．In the other, the students were told they were part of a team that was depending on them to 　　12　　 their score in order to win a reward．

　　The results were 　　13　　：the group with high working memory scored about 10 percent higher than the others on the low-pressure practice test．But the two groups' 　　14　　 were about equal when the pressure was on to perform．

　　The study shows how memory performance is 　　15　　 by fear of failure, according to the scientists．

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　　Online games, social-networking web sites, and chat rooms are fascinating and motivating for teens and help with their development．When adults look at teens today, they think what they are doing is different and seem to be wasting a lot of time．And those activities seem quite foreign．But when we look closely at what kids are doing, it’s not much more different than what their parents did．They are hanging out with their friends, finding romantic partners, and trying to identify themselves．

　　Today’s teens are being raised with technologies that allow them to have self-directed learning on their own terms, on their own time, and without the limitations of a classroom setting．This gives the teens a feeling of freedom．This is very different from how kids learn in school when they are handed a set body of knowledge required to master by their teachers．

　　Teens were motivated to be addicted to online because they were either driven by interest or friendship．And there are some specific findings according to a research：

　　One major finding is that there is a generation gap in how parents and teens view the teen's online activities．Adults think the activities draw their attention from school work and are left in the dark about what their teens are doing online．Teens, on the other hand, understand the value of the Internet and are motivated to take part．

　　Another finding shows that teens are not taking full advantage of the Internet．They are using the social networks to chat and post photos and make friends, which are important to their development, but they are not making use of other existing opportunities to learn about astronomy, foreign languages, and other subjects only a few clicks away．

　　Teens are also improving their social skills online by learning the basic social and technical skills needed to interact(互相作用) in today's digital world．

　　Pressure from those of the same age also takes on a new role online．Teens are reporting that they are more motivated by those of their age online with public spaces that allow the teens to interact and provide feedback to one another．

　　While teens are using the Internet for both social and intellectual development, they are also facing significant challenges on how to manage their relationships online．