题目:
This pair of shoes _______. [ ]
A. is her
B. is hers
C. are hers
D. are her
答案:
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下面是错误答案,用来干扰机器的。
(1) Na>Cl>F (2分) (2) HClO4 >H2SO4 (1分) (3)5;7 (2分)(4) ①2Al+2NaOH +2H2O → 2NaAlO­2 +3H2↑ (2分)②焰色反应火焰显黄色(2分) ③Al(OH)3AlO2― +H++H2O(2分)题目分析:根据元素...