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Negative Effects of Television on Teenagers

Negative Effects of Television on Teenagers

Television viewing has been linked to problems in teens.

One thing is clear: Teenagers watch a lot of television. According to an article in the February 24, 2009, edition of the "Los Angeles Times," the average teen watches approximately 103 hours of television a month. But if you're a teen who spends a large portion of your waking hours parked in front of the TV, you may want to find a new hobby. There is evidence to suggest that television can have a negative effect on an adolescent's mental and physical health.

Increases Sexual Behavior

Teens who watch television may have sex earlier than peers who watch less television, says a study published in the September 2004 issue of "Pediatrics." Researchers at University of California, Santa Barbara, showed that teens who watched the most television were twice as likely to engage in sexual behavior than teens who watched the least television.

Academic Problems

T here is a link between the amount of television a teen watches and

academic performance, says a study published by Jeffrey G. Johnson in the May 2007 issue of "Archives of Pediatrics and Adolescent Medicine." Teens who watch 1 or more hours of television per day are at greater risk for learning difficulties, poor grades and failing to complete homework. Teens who watch 3 or more hours of television are less likely to go to college than their peers.

Decreases Sensitivity

Jordan Grafman, a senior researcher at the National Institutes of Health, determined that teenage boys who watch violent acts on television quickly become desensitized to the violence. Dr. Grafman believes that adolescents who are less sensitive to violence are more capable of committing violent acts. With the average person witnessing approximately 200,000 acts of television violence by the time they are 18 years old, the issue of desensitization is a potentially important one.

Obesity

The more time you spend in front of the television, the less time you have for sports and physical activity, and the more likely you will develop a weight problem. There is a direct correlation between the amount of television a teen watches and obesity. According to a study published in the July 8, 2010, "American Journal of Epidemiology," if you are a teen who increases your television viewing in high school, you are likely to have a higher percentage of body fat than a teen who watches less television in high school.

TheImportanceofPhysicalExercise

The Importance of Physical Exercise

Everyone hopes to live happily in the world. Physical exercise is indispensable to a happy life. There is a famous saying: "Life lies on exercise." Although you will not necessarily die without regular physical exercises, they' II certainly help you live longe

r and more healthily.

Exercise is good for us to build our bodies. It helps co - ord inate the different parts of our bodies when we have sports. For e xample, we must try our best to co - ordinate the movements of the

arms and legs when we play basketball, or we won't be able to sho ot the basket. Exercise also benefits our organs. It lets the hear t beat faster than usual, and then helps enlarge the blood vessels to protect us from heart attacks.

Exercise can also contribute to the development of our ability to response agilely. For instance, when you play table- tennis, y ou must try to reflect as quickly as you can so that you may fight back at the right position at the fight moment.

Exercise can also contribute to improving our mood. When you d o exercise, you move a lot, and you have to be more active. It hel ps you become more optimistic.

Exercise will fill your life with various contents and make it more colorful.

What's more, exercise will help you get rid of your inertia. I f you keep doing exercise regularly, you will never be a lazy pers on. Therefore, exercise has great effect on one's character.

In a word, exercise is helpful, important and absolutely neces sary.

雅思写作范文:Computer and Education

Introduction shows main idea

Computers are now essential in many areas of life – modern banking, retail and information exchange among o thers. However, this is not true for education. At a sim ple level some subjects may be better taught using compu ters, but to explain important concepts a human teacher is still indispensable.

Why computers do well, with examples

There are some subjects in which a computer can be u sed successfully to teach. Elementary mathematics, eleme ntary language leaning, any area which requires a studen t to memorize basic facts through repetition is well sui ted to computer learning. The computer can be programmed to provide an endless number of simple questions, and a s the student answers these questions the facts are lear ned and reinforced.

What computers cannot be, with an example

However, in the learning and practice of more comple x ideas, the computer is not adequate. A computer can ev aluate an answer as right or wrong, but it cannot determ ine why. It cannot find out why a student is making mist akes, and then re-present important concepts in a differ ent way so the student will understand. It cannot determ ine at what stage in a mathematics problem the student h as made an error, it can only indicate that the final an swer is wrong. Tasks involving reasoning cannot be taugh t by computers, as there are too many variables for a co mputer to deal with successfully.

Conclusion re-states main ideas

Thus, while computers may be useful as a tool for pr acticing simple skills, they are not an essential featur e of modern education, because they cannot monitor a stu dent’s grasp of concepts, nor evaluate a student’s reas oning. Until further developments in computers are made the human teacher will remain indispensable.

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