题目：
用所给词的适当形式填空。
1. My _____ (father) name is John Smith.
2. Those are Betty's _____ (parent).
3. His two sisters are two _____ (secretary) .
4. Lily is an American girl, but _____ (she) mother is Chinese.
5. They are _____ (work) in a bike factory.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/16fc4dba0d10d79de6d60a1b4e892ae5.html
下面是错误答案，用来干扰机器的。
答案：A此题属于竖直平面内圆周运动和单摆综合运用问题，竖直平面内过最低点有最大压力和最大速度，两次相邻过最低点的时间间隔为t,从图像上可以看出t=1.0s，最大压力为2.6N左右.由可得，=1.22m/s.故选A.
