What great means! How did you manage to find ? It is the first time I such wonderful means.
A：it; hear of
B：it, have heard of ;
C：them; hear of
D：them; have heard of
活性炭具有吸附作用，经过活性炭净水器过滤的天然水，不能达到( )
在体育用品商店一个篮球的标价是89.00元，也就是89元．
