题目:
(2013·陕西师大附中模拟)If we had taken such effective measures much earlier, the river ________ so seriously now.
A.is not polluted
B.would not be polluted
C.had not been polluted
D.would not have been polluted
答案:
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(每空1分,共9分)(1)b(2)钠, , (3)HClO4,NaOH,Al(OH)3 (4)Cl, Cl2+2Br-=2Cl-+Br2题目分析:(1)b的区域中是过度金属,故全部是金属元素的区域b。(2)同周期,自左向右,原子半径...