生物体生命活动的物质基础是指
A:各种化合物
B:大量元素和微量元素
C:各种化学元素
D:组成生物体的各种化学元素和化合物
The dictionary is ______: many words have been added to the language since it was published.
下列函数图象关于原点对称的有( )①fx=x-1+1-x;②fx=log2x+x2+1;③fx=1x,x∈-1,0∪(0,1④fx=-xlgx.