6．对于任意，函数的值恒大于零，那么的取值
范围是 ( )
A． B． C． D．
5．如图，是O在内部，且有，
则的面积与的面积比为 ( )
A．2 B．3
C．4 D．6
4．已知等差数列的前项和，若，且A、B、C三点共
线(O为该直线外一点)，则 ( )
A．2009 B． C． D．
3．函数的反函数为 ( )
A．
B．
C．
D．
2．等差数列中，，公差，且、、恰好是某等比数列的前三项，
那么该等比数列的公比
A．2 B． C． D．4
1．的值为 ( )
3．开头句子已给出。不计人句子总数。
Last week，we did research into how laid-off workers get their New jobs．
_______________________________________________________________________________________
_______________________________________________________________________________________[答案]
Last week, we did research into how laid-off workers get their new jobs. Some students surfed the Internet and learned that most of the laid-off workers had already got their new jobs. The city government provided a vocational training center, where five courses for laid-off workers were offered. After training, they began working as repair workers, cooks, typists, household workers and salespersons. The other students interviewed some laid-off workers who had got new jobs. A woman said, "With The help of the government I've found my new job."
What a great deal we've learned through the research !
2．将5个句子组织成连贯的一篇短文，使用必要的连接词。
1．必须使用；个句子介绍全部所给的内容。
4．通过研究性学习．我们学到了更多。
[写作要求)
，函数
的值恒大于零，那么
的取值
B．
C．
D．
如图，是O在
内部，且有
，
的面积比为 ( )
的前
项和
，若
，且A、B、C三点共
( )
C．
D．
的反函数为 ( )
，公差
，且
、
、
恰好是某等比数列的前三项，
C．
D．4
的值为 ( )
B．
C．