第几肋骨前端有肋软骨与胸骨相连（）
A.第1～10肋
B.第1～12肋
C.第4～10肋
D.第1～3肋
E.第4～12肋
参考答案：A
根据句意及单词的首字母完成句子。
1. Are you afraid when you see anything s at night?
2. You can e four seasons(季节) in a day there.
3. My dog f me to school every day.
4. Yesterday was my birthday. My parents b a book for me.
5. I can't i what our life will be like in the future.
A．产生电场的为负电荷，电荷在图中的右边
B．带电粒子在a、b两点的受力方向和加速度方向
C．带电粒子在a、b两点的动能、势能何处较大
D．带电粒子由a运动到b再到c时，电场力不做功
