尼亚加拉瀑布位于以下哪几个国家交界处:( )
A. 墨西哥
B. 美国
C. 澳大利亚
D. 加拿大
E. 俄罗斯
How many users are there on WeChat?
A. More than 600 million
B. More than 700 million
C. More than 800 million
What are the functions the video shows about WeChat?
A. Video call
B. Camera
C. Text message
D. Group chat
What are the ways of making friends on WeChat?
A. Shake
B. People Neaby
C. Scan a person's QR code