A:x2+x2=x4
B:(x-y)2=x2-y2
C:(x2y)3=x6y
D:(-x)2·x3=x5
下列关于硫的叙述中,正确的是( )
人体呼出的气体中二氧化碳含量增多了,这些二氧化碳产生于( )
—Most people said the film Let The Bullets Fly was wonderful _____ they watched it.—I agree with them, and I like it very much!
西亚很多国家的人均收入居世界前列,与本区大力发展什么工业有关( )。