关于x的一元二次方程x2+（k2-4）x+k+1=0的两实数根互为相反数，则k的值（ ）
A：-1
B：±2
C：2
D：-2
下列关于生理盐水的说法中，错误的是（ ）
中华文明勃兴并为后世博大精深的中国文化奠基是在（ ）
变色龙随环境改变体色 ____ A拟态
箭毒蛙具有鲜艳的体色 ____ B警戒色
竹节虫的体形像竹节 ____ C保护色
Would you like to learn English well?
4 weeks
Monday (18:30-20:00)
English Club
Phone NO.62258
Do you enjoy learning to use the computer?
3 weeks
Tuesday( 19:30-21:00)
Internet Club
Phone No.62279
Would you like to be an artist?
For drawing beginners only
8 weeks Thursday (19:00-20:30)
Art Club
Phone No.62537
Fancy taking photos?
Bring your camera with you!
6 weeks Saturday (9:00-10:30)
Photo Club
Phone No.62587
Are you good at swimming?
7 weeks
Sunday (100:00-11:30)
Swimming Club
Phone No.61852
Are you animal lovers?
5 weeks
Wednesday (14:00-15:30)
Nature Club
Phone No.61866
There are____clubs here for people to choose from.
People go to all these clubs____a week.
Only drawing____can go to Art Club.
____Club and____Club last for less than one month.
If you are free only in the afternoon, you can go to ____ Club.
People in Photo Club must bring a ____ with them.
If you like animals , you can call on ____
____ Club is the longest and ____Club is the second longest.
