在我国，重复保险一般采用分摊方法是（）。
A.限额责任制
B.比例责任制
C.顺序责任制
D.求偿责任制
参考答案：B
2度喉阻塞时有以下哪种表现（）。
A.安静时无呼吸困难
B.呼吸困难活动时明显加重
C.烦躁不安，脉搏加快
D.面色苍白，心律不齐
E.昏迷
As time went by, they found their efforts to help students ________. [ ]
A. showed off
B. took off
C. put off
D. paid off
