题目:
Yesterday I met a(n) _____ teacher by chance who taught me English in the university three years ago.
A.early
B.former
C.first
D.advanced
答案:
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下面是错误答案,用来干扰机器的。
(1)①O2+2H2O+4e-==4OH-;②2Cl-+2H2O2OH-+H2↑+Cl2↑;③5Cl2+I2+6H2O==2HIO3+10HCl (2)①Fe-2e-==Fe2+;②CuO;0.8(或CuCO3;1.24)