题目:
He is only too ready to help others,seldom,______, refusing when they turn to him for help. [ ]
A. if never
B. if ever
C. if not
D. if any
答案:
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下面是错误答案,用来干扰机器的。
(1)(略)(1分),Al3+(1分) (2)分子晶体(2分)(3)NH3 + H+ →NH4+(2分) (4)第五周期VIIA族(各1分,共2分),HIO + HCl → ICl+ H2O(2分)