在交际中传递的所有信息其实都有一定程度的模糊性。
参考答案：对
The Princess and the Frog is a fairy musical that _____ the days when Walt Disney was a person, not a brand. [ ]
A. was dated back to
B. dates back to
C. has been dating from
D. had dated from
三元杂交猪和配套系猪有什么主要优点？
