某小区物业征集业主意见，计划从100户业主中抽取20户进行调查。100户业主中有b户

小说通过典型的语言描写，把几个有着不同性格特点的妇女形象______地展现在读者面前。填入划横线部分最恰当的一项是( )。

A．惟妙惟肖

B．有声有色

C．绘声绘色

D．活灵活现

化纤制紧身胸衣

红降现象

It can be inferred from the passage that electric response audiometry would be especially recommended for_______.

A．a three-year-old girl who has an earache

B．an old man who cups his ear to ear

C．a young child who does not talk

D．a rock musician who plays the drums

某班新年联欢会原定的5个节目已排成节目单，开演前又增加了n个新节目．如果将节目插入原节目单中，那么不同插法的种数为。

(1)n=2；(2)n=3．