题目

在翻修旧房时，工人同时将两块砖水平叠放在一起以某一初速度竖直向上抛出，如图所示。砖到达最高点时刚好被另一工人接住，空气阻力忽略不计。从抛出到将要被接住的过程中，下列说法正确的是（） A . 下面砖对上面砖的弹力方向向上 B . 下面砖对上面砖的摩擦力方向与速度方向相反 C . 下面砖对上面砖的没有弹力 D . 下面砖对上面砖的摩擦力方向垂直速度方向 It is said that John's wife and his children ________ to see him off before the launch, but they failed because of the rules． [　　] A． had hoped B． hope C． have hoped D． were hope