4. When you have finished the book, please            it on the shelf.

A. replace          B. devote            C. consider          D. equip

3. Several rounds of air and ground attacks left the whole Bagdad, the capital of Iraq,      .

A. in pieces              B. in ruins            C. in parts                   D. in places

2. The little boy kept on asking his mother to buy a toy car for him, and finally the mother

gave           .

A. in                  B. up                   C. away               D. out

1. In order to prevent the fire spreading, some of the houses nearby had been        before

the firemen arrived.

A. pulled back          B. pulled down    C. brought back    D. burned down

       （3）设的最小值为

2009年深圳市第二实验学校高三模拟考试三

      （2）当x>0时，证明不等式

      （1）的单调区间；

设函数

21．（本小题满分14分）

   （2）令，求数列b_n的最小值。