（）无缝线路，一般由固定区、伸缩区、缓冲区三部分构成。
A.放散温度力式
B.温度力式
C.放散温度应力式
D.温度应力式
参考答案：D
I have been studying for two hours. Can I stop _______and play computer games for a while? [ ]
A. to have a rest
B. having a rest
C. to having a rest
D. have a rest
