————,it is dangerous to look out of windows when are on the train.
问题描述:
————,it is dangerous to look out of windows when are on the train.
有3个选项
A.Look up B.Look out C.Look after
答
选B
因为look up有查询,抬头看等意思,可以说look up the dictionary
而look after 是照顾照料的意思,look after the child
look out 有当心,小心的意思,所以选、B