It is human activities on the earth that are to ______global warming.

A．be blamed for

B．blame for

C．take charge of

D．be responsible with

下列各组中化合物的性质比较，不正确的是（　　）

A．酸性：HClO₄＞HBrO₄＞HIO₄

B．碱性：Ba（OH）₂＞Ca（OH）₂＞Mg（OH）₂

C．稳定性：HCl＞H₂S＞PH₃

D．还原性：F^-＞Cl^-＞Br^-