①KOH Na2SO4 AlCl3 ②NaHCO3 NaNO3 H2SO4
③HCl NaAlO2 NaCl ④Ca(OH)2 Na2CO3 BaCl2.
复数z=1-i,则1z+z对应的点所在的象限为( )
Pollution has done great harm to ____(live) things on the earth.