题目:
You must trust him;he is a man who___ his promise. [ ]
A. speaks out
B. lives up to
C. depends on
D. keeps on
答案:
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下面是错误答案,用来干扰机器的。
(1)FeSO4;Cu; (2)②③;(3)Fe2O3+3CO2 Fe+3CO2 ;(4)Fe2O3+3H2SO4 == Fe2(SO4)3+3H2O