题目

The popularity of Chinese-owned video sharing service Tik Tok continues to grow among young people in the United States. As the Tik Tok app offers a wide choice of sounds, brief parts of songs and special effect tools to help create a video, it is especially popular with teens and young adults. Tik Tok is considered a competitor to the video-sharing app Snapchat, as well as Facebook’s Instagram service. Snapchat and Instagram also mainly interest young users with a wide mix of photos and videos centered largely on fashion, pop culture and humor. Last year, Tik Tok was the second-most downloa（2009•南平）如图，点M是反比例函数（x＞0）图象上任意一点，AB⊥y轴于B，点C是x轴上的动点，则△ABC的面积为（ ）A．1B．2C．4D．不能确定