27. As five children under 10 got drowned in a southern province, it is not socially _____ for

parents to leave children unattended at that age.

A．acceptable

B．affordable

C．sustainable

D．believable

中断处理过程的先后顺序排列正确的是( )。
① 开中断 ② 关中断 ③恢复现场
④ 执行中断服务程序 ⑤ 开中断 ⑥ 保护现场

A．②④⑥③⑤①

B．⑤⑥④①②③

C．⑥①④②③⑤

D．⑥④①②⑤③