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
2Z(g)+W(s)，△H<0的反应过程。若使a曲线变为b曲线，可采用的措施是： （ ）