Social media is one of the fastest growing industries in today's world. A study conducted by the US Pew Research Center showed that 92 percent of teenagers go online daily. The wide spread of social media has changed nearly all parts of teenagers' lives.

    Changing relationships

    High school student Elly Cooper from Illinois said social media often reduces face- to-face communication. “It makes in-person relationships harder because of people's attention given to their phones instead of their boyfriends or girlfriends,” Cooper said.

    Yet, some people believe social media has made it easier to start relationships with anyone from anywhere. Beth Kaplan from Illinois met her long-distance friend through social media. He currently lives in Scotland, but they're still able to frequently communicate with each other. “I can feel close to someone that I'm talking to via FaceTime,” Kaplan said.

    Wanting to be “liked”

    The rise of social media has changed the way teenagers see themselves. The 19- year-old Essena O'Neill announced on the social networking service Instagram that she was quitting social media because it made her unable to stop thinking about appearing perfect online. Negative comments also can do great damage to a teenager's self-esteem. Teenagers who get negative comments can't help but feel hurt.

    Opening new doors

    However, Armin Korsos, a student from Illinois, takes advantage of the comments he receives over social media to improve his videos on the social networking site YouTube. “Social media can help people show themselves and their talents to the world in a way that has never been possible before,” Korsos said.

屋檐下重为G的风铃被水平风力吹起，在偏离竖直方向θ角的位置保持静止，设风力为F，系风铃的轻绳对风铃的拉力为T，若F恒定，则下列说法正确的是（   ）

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Don'tyou just love ice skating every winter? I am sure that since winter isapproaching, your skates are set to come out, just waiting to be used. Impressyour friends with a new trick on how to ice­skate backwards with the help ofthese trips.

Stand straight

 The first thing that you need to do is standstraight.____， if you feel that you are falling backwards. Don't worry；this happens to all.

 Confidence is what you need

Themost important step while learning how to skate backwards is having enoughconfidence in yourself and in what you are doing. How can you achieve this? Bypractice. One of the important ice skating tips and techniques is that if youfeel that you are losing your balance, then scissor (做剪式运动) your skates____.

 Maintain speed

 Try sculling with one skate while rolling in astraight line with the

 other____.Now bring the skate which you are using to scull, and then again,repeat the same process. Make sure that you put most of your weight on theskate which is moving straight and not the one with which you are sculling.Now, try the same thing using the other foot.

____

 Once you are confident that you can scull witheither foot, the next thing that you have to do is increase your speed. Trysome of your own tricks now. Scull with either foot or with both at the sametime.

 Scull and be aware

 While you keep one foot straight, keepsculling with the other. You can do that with both feet at the same time.____，but don't get so involved that you don't see where you are going. If you arenot watching your back, you might just bang into something or someone.

A．That is, keep pushing yourself backwards with an outwardstroke(滑动)

B．While going backwards, just get used to the feeling ofmoving backwards

C．Keep practicing this till you are confident about it

D．Increase your speed now

E．One must be brave enough to learn to ice­skate backwards

F．Concentrate on what you are doing

G．Just put your chin up and slightly bend your knees