单项选择题
A．She is a high school student. B．She is an opera singer. C．She is a college student. D．She is a pop singer.
A．Doing regular checkups to prevent illness that threatens our longevity. B．Doing crosswords puzzles. C．Doing everything in the list. D．Doing gardening everyday.
A．Disorder decreases with time. B．Disorder increases with time. C．Order increase with time. D．Order decrease with time.