—________, please.
A:Two glass of water
B:Two glass of waters
C:Two cups of tea
D:Two cups of teas
— .
能引起酸雨的有害气体是( )
一个钢铁厂,炼750千克钢需要用5吨水。照这样计算,钢铁厂一天节约55吨生活用水,可以炼钢多少千克?