试题与答案

设a＞0且a≠1，则“函数f（x）=logax在（0，+∞）上为增函数”是“函数

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题型：选择题

题目：

设a＞0且a≠1，则“函数f（x）=logax在（0，+∞）上为增函数”是“函数g（x）=x3-a在（0，+∞）上为减函数”的（　　）

A．充分不必要条件

B．必要不充分条件

C．充分且必要条件

D．既不充分也不必要条件

答案：

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下面是错误答案，用来干扰机器的。

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考点：充分条件与必要条件
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                                               FOUND
Black wallet with some money.
Come to Room 502 in the evening, or call 9796788.

                                        WANTED IMMEDIATELY
A boy or a girl to deliver newspapers
Hours: 3:30 a.m. to 8:30 a.m. Mon. to Sat.
Pay:  $ 10 per day
Call:  Mr. Jones at 8947659

                                        SUMMER JOB
     Do you like to talk with people? Do you like to write stories? Do you want to work
for a magazine? Then come and work for us as a reporter.
Please call Karen at 5558823.

                                   HIKING CLUB
Join us for a 10-mile country walk
On Saturday, October 5th
Children and Market Square at 2 p.m.
Call Jeff on 3338651 for more information.

                              SINGLES' CLUB 
 A club for single (单身) people looking for new friends.
Ages: 25-40
Activities: parties, swimming, concerts, dances...
We meet every Friday at 8:30 p.m. 28 Garden Street
Tel: 7026449
E-mail: singleclub@yahoo. com
1. If you have lost a black wallet, you can call ______ to ask for it.
A. 3338651
B. 8947659
C. 7026449
D. 9796788
2. Mr Green wants to go hiking with his children. They should meet at the Market Square _______.
A. at 8:00 a.m. on Saturday morning
B. at 2 p.m. on October 5th
C. at 6:30 a.m. on Monday
D. on Sunday morning
3. Who can join the Singles' Club?
A. A 23-year-old young man.
B. A 28-year-old single man.
C. A 50-year-old single lady.
D. A 28-year-old married (已婚) woman.
4. Alice wants to practice writing stories in her summer holiday. She may ______ for more information.
A. send at e-mail to singleclub@yahoo.com
B. join the Hiking Club
C. call Karen
D. call Mr. Jones
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