that China has the largest number of mobile phone users. [ ]

A. Someone says

B. It is said

C. They told me

挥发性有机物指常温下能够挥发或气态的有机物，世界卫生组织（HO，1989）定义熔点低于室温、沸点在（）度之间的有机物为挥发性有机物，英文VolatileOrganiccompounds，简写为WOCS。