题目

1.  图所示物体的某些部位在使用中能够减小压强的是                       （     ）     A．注射器的针尖     B．菜刀的刀刃       C．宽宽的书包带     D．图钉的针尖  答案：C解析:略 I didn't know ________. [　　] A．where does he liveB．where do he live C．where he livesD．where he lived