_______ to ride a bike from your school to the park?
A：How long did you spend
B：How far did it take
C：How long did it take you
D：How far did you spend
“这部巨著表明，一切能够计时与测量的运动，无论是在地球上的伙食在太阳系内的，都可用相同的数学公式来加以描述。”这部巨著的产生（ ）
按要求写出分数．
以7为分子，写出3个假分数____．
