A：30%、20%、50%
B：40%、30%、30%
C：30%、30%、40%
D：30%、40%、30%
一个容量为n的样本，分成若干组，已知某数的频数和频率分别为40、0.125，则n的值为（ ）
—Excuse me, can I smoke here?
—No, ____________ .
— Hi, Michelle, I can't find my e-dictionary.
— Sorry, I _________ it. I guess I put it on the top shelf with my things.
