以下哪一项体现了人类行为的生物性（）。
A.行为与遗传有关
B.喜穿红衣服
C.迷恋歌星
D.集体锻炼
E.拒绝看病
参考答案：A
一颗子弹沿水平方向射来，恰穿透三块相同的木板，设子弹穿过木板时的加速度恒定，则子弹按先后顺序穿过三块木板所用的时间之比为______．
—I called you at half past nine this morning but there was no answer.
—Oh, sorry. I ______ with my cousin at the supermarket. [ ]
A. shop
B. was shopping
C. shopped
D. will shop
