通常所说的“白色污染”是指[ ]
A．冶炼厂的白色烟尘
B．石灰窑中的白色粉尘
C．白色塑料垃圾
D．白色建筑废料
答案：C
One possibility is that tears get rid of certain chemicals from your body _____ build up during stress.
A．to which
B．that
C．where
D．in which
在稀盐酸酸性条件下与氯化钡反应可进行检查的杂质是
A．重金属B．砷盐C．铁盐D．硫酸盐E．铵盐
