颈部前屈时关节活动范围的正常值是（）
A.0°～60°
B.0°～50°
C.0°～90°
D.0°～100°
E.0°～110°
参考答案：A
根据句意及首字母或汉语提示完成单词。
1. She lives a_____in a small village, but she doesn't feel lonely.
2. People will be a_____to visit Mars in the future.
3. I will _____(或许)go skating and swimming every day.
4. Yang Zhenning is a famous_____(科学家)．
5. I think_____(预测)the future can be difficult.
单根粗钢筋用作预应力筋时，张拉端采用( )锚具。
A．螺丝端杆B．镦头C．帮条D．JM—12型
