细菌和真菌有的需要氧属________型；有的属________型，如乳酸菌。
需氧 厌氧
已知一个一次函数的自变量的取值范围是2≤x≤6，函数值的取值范围是5≤y≤9，求这个一次函数解析式．
It's said that there're millions of camels in India and ________ of them is still increasing.
A．the number
B．the amount
C．the quantity
D．a number
