Free Activities This Weekend
An Open-air Craft(工艺)Market in Front of the City Hall Sunday from8:30A.M. to 6:30 P.M. Need to buy a present? Find bamboo toys, paper flowers, paper umbrellas, model cars and more! Food from around the world, too!	City Museum Travel Movies Meeting Room Sat.& Sun. at 2:30 P.M. Do you want to travel but don't have enough money? See movies on Japan, Italy, America, England, Russia, and Australia. There are only 80 seats, so come early.	Autumn Fashion Show Golden Shopping Center Sunday at 3:00 P.M. Men's and women's autumn clothes. See 25 handsome and pretty models show the latest fashions. All clothing will be on sale after the show for under ￥100.
Pop Concert at Yunhai Square Saturday from 9:00 P.M. to midnight Five groups of college students are going to play the guitar and sing pop songs. Bring your own food and drink.	Library Lecture(讲座) City Library Hall Saturday at 10:00 A.M. How to find the job that you really want! Two-hour lecture. Advice on choosing and getting the right job for you. Coke and sandwiches are sold.

 

对于任意实数x，不等式（a﹣2）x²﹣2（a﹣2）x﹣4＜0恒成立，则实数a的取值范围是____．

阿伏伽德罗常数约为6.02×10²³mol^﹣1．下列叙述中正确的是（   ）

一个不透明的盒子中装有两个白色乒乓球和一个黄色乒乓球，它们只有颜色的不同，甲、乙两人玩摸球游戏，每次只能摸出一个球．规则如下：甲摸一次，摸到黄乒乓球，得1分，否则得0分；乙摸两次，先摸出1个球，放回后，再摸出1个球，如果两次摸到的都是白色乒乓球，则得1分，否则不得分，得分多者获胜，如果平分，则再来一次，问此游戏是否公平，并请通过计算说明理由．

I'm ____. I have small eyes and small ears. I have a          tail. I like bananas.