— Tom, don't forget to return this dictionary by Saturday.
—_________ .
A:Got it
B:Good luck
C:That's right
D:It's nothing
of the students are going to visit the factory next week.
先化简,再求值: (x+2)(3x−1)−3(x−1)2,其中x=−1.
“怀疑是智能的动力,过度的确信不疑让我们深受其害。最强大的哲学便常常是:有没有这种可能性?你是错的。”这段话告诉我们( )