题干
. He was in hospital for six months. He felt as if he was ________ from the outside world.
A：cut out
B：cut off
C：cut u
D：cut through
答案(点此获取答案解析）
B
A：cut out
B：cut off
C：cut u
D：cut through
4NO（g）＋6H2O（g）下列叙述正确的是( )。