题目内容：

    A new report from the U.K. says that more than 1 in 5 teens there spend five hours or more per day on social media. And the heavier users of social media go to bed later and get poorer quality sleep. The new study was based on self-reported survey data from nearly 12,000 teenage participants in the U.K. Millennium Cohort Study.

Megan Moreno, a researcher at the University of Wisconsin-Madison, says that social media  is too often described as either entirely good or bad, when the reality is more complicated for teens. "Social media may have its problems, but it is the way that they stay in touch with each other," she says.

Perhaps unsurprisingly, the study found a link between high social media usage and poor sleep patterns. Specifically, teens who report heavier social media use go to sleep later. And, the study authors note, late bedtimes are linked with poorer academic and mental health outcomes.

Holly Scott, a researcher at the University of Glasgow, isn't sounding the alarm. She says,  "it's easy to look at the results of this and think, 'We should just get teenagers to spend less time on social media.' I think that's an understandable response, but what I really encourage people to do is look beyond that." She says people should pay attention to the "important emotional and cognitive and social factors" at play with when teenagers are using social media.

Scott emphasizes that the study is pointing to a correlation between social media and poor sleep, but not necessarily demonstrating cause and effect.

"Certainly some teens do say that they struggle to get off of social media at night — they might be worried about missing out on things, or affecting their friends by not answering  messages — and they stay up late from that," she says. But, "maybe for some of those young people they have a naturally later body clock, and are passing their free time at night on social media until they're ready to fall asleep," she says.

1.What’s the purpose of the new study in the U.K.?

A.To find the benefits of using social media.

B.To know the effects of using social media.

C.To know teenagers’ habits of using social media.

D.To prove the growing popularity of social media.

2.What attitude does Megan Moreno take towards social media?

A.Critical.

B.Positive.

C.Objective.

D.Confused.

3.What does Holly Scott think of social media’s causing poor sleep?

A.It’s interesting.

B.It’s impossible.

C.It’s beyond doubt.

D.It lacks evidence.

4.What is the best title for the text?

A.How to Sleep Well Tonight

B.Social Media Is Wasting Our Time

C.Teens May Be Losing Sleep Over Social Media

D.Make Use of Social Media in an Effective Way