Since last year, short videos have gotten tons of attention online. Many people create and share short videos on popular video apps like Douyin and Kuaishou. You can even add music and special effects (特效) to your videos. The videos are 15 seconds to a few minutes long. They show people doing activities like cooking, exercising and singing.

Teenagers especially enjoy these videos. Many junior high school students said they enjoyed watching these short videos. The videos let teenagers see funny and exciting things they don't usually see. Many teens like to share the fun things they do with others as well. For example, a 12-year-old user named Xiaoqianyu has posted videos showing her learning jazz dance. This has won her many fans.

However, the videos can also cause trouble. Some students spend too much time watching them and not enough time studying.

To deal with this problem, Douyin added a new function (功能) in April. It locks the app if someone uses the app for over two hours a day. In the same month, the government asked companies to regulate(管理) these apps much more strictly.

1.How long does a short video usually last according to the passage?

A.15 seconds B.A few minutes C.over 2 hours D.15 seconds to a few minutes

2.What does It in the last paragraph refer to ?

A.The app B.The government C.The new function D.The website

3.What is the passage mainly about?

A.Short videos are now popular among teenagers. B.Short videos can cause trouble.

C.Xiaoqianyu won many fans by posting videos. D.Short videos are funny and exciting.

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