In a video，young children call out to their mother or father；the parents enter the room smiling，turn around and call out to their own parents；the grandparents then enter smiling and call out to their parents—the great—grandparents.
   The format（形式）of this kind of video is being described as the"four—generation（代）challenge".It started on the Chinese short—video platform，Douyin，and has since spread to social media in other countries.People from all over the world have commented （評論）on the videos and even made their own versions.
   "I have to give that to China.Family care is usually a strong value，"wrote one Facebook user named Antoine Yupud.The"four—generation"videos have not only touched foreign viewers but also given them a deeper look into Chinese family values.
   In most East Asian cultures，it is common for many generations of a single family to live together.This is called a big family.In most Western countries，most families are small families，or families that are made up of just children and their parents.
   In Western culture，independence are highly valued.Kids usually move out of the house after they become adults.Many of them take part—time jobs in order to pay for college and rent（房租）.If they choose to continue living with their parents after becoming an adult，it can be seen as a sign of immaturity（不成熟）or failure.
   Although family structures in the East and West may be different，the love between family members is common.That might be why the"four-generation"videos have won so many hearts around the world.

（1）What's the "four-generation challenge" video mainly about？

D

D

A．How family members eat together.
B．How children play with their parents.
C．How grandparents are well cared for.
D．How four generations of one family can live together.
（2）Paragraph 2 is written to show that

B

B

.
A．the video format is hard to be copied
B．people all over the world like the video format
C．Douyin is a great success in foreign markets
D．foreign people don't have such big families
（3）What might be the key to making the video popular in the world？

C

C

A．Foreign people's curiosity（好奇心）about Chinese culture.
B．The differences between different cultures.
C．The commonly shared love in families.
D．The video format that never appeared before.