Directions: Read the following passage. Summarize in no more than 60 words the main idea of the passage and how it is illustrate. Use your own words as far as possible.

A “ Robert” in Your Pocket

The final bell rings at a high school in downtown Los Angeles, and nearly every student walking our of the school gate studies a screen, with head bowed. Over the past decade, such scenes have become the norm — at least in the United States. Research reveals that American millennial (千禧一代的人) look at their phones 150 times a day on average.

In the meantime, the number of American teenagers reporting feelings of depression has grown significantly. Some people blame the increase on the Great Economic Depression following 2008 and other social changes. However, a big new study suggests a different explanation — the rise of social media.

Jean Twenge, a psychology professor at San Diego State University, led the study. With data collected from more than 500,000 American teenagers, she found that those who spent lots of time on social media were more likely to agree with remarks such as "The future often seems hopeless. Those who used screen less, spending time playing sport or socializing with friends in person, were less likely to report feelings of depression.

This, in fact, is not the first time that scientists have found that social media can rob people of their happiness. One study published in 2016 asked a randomly selected group of adults to quit   Facebook for a week. It turned out that they reported feeling less depressed at the end of the week than those who continued using it.

Some research, however, suggests that social-networking sites can promote happiness if used to engage directly with other users, rather than just to feel jealous of happy moments someone shares online. This provides a reminder that it is user's attitudes that shape their experiences on social media. "I often remind myself that it's all filtered," reflects Sarah, a junior at the high school in Los Angeles. "People only post what they want you to see, so it can seems that their life is better than yours." But when asked if she has ever considered deleting her social media accounts, Sarah looks confused. "No. I would feel lost."

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