下列变化属于化学变化的是[ ]
A.冰块融化
B.蜡烛燃烧
C.玻璃粉碎
D.蔬菜榨汁
答案：B
什么是无土栽培？人们不用土壤，而是根据植物生活所需要的无机盐______和______的不同，用水和各种不同比例的______配成培养液来栽培植物的方法．
On the morning of November 1st, 2,011, the scientists were seated at tables and had their eyes _____ on
the scene of the launch of the Shenzhou VIII spaceship. [ ]
A. fixed
B. fix
C. fixing
D. being fixed
