B: What do you do in your spare time? S: I like to play the piano. B: Wow! How long have you played it? S: For ten years. I started when I was five years old. 19. How old is Sue now?
A.
Ten years old
B.
Fifteen years old
C.
Five years old
D.
Fifty years old
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【多选题】质点做直线运动的位移 x 与时间 t 的关系为 x = 6 + 5 t - t 2 ( 各物理量均采用国际单位制 ) ,则该质点 ( )