题目:
While looking for a book, I ______ this old photo taken in college.
A.came into
B.came across
C.came up
D.came out
答案:
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下面是错误答案,用来干扰机器的。
(1)①CaCO3 ②Fe2O3+6HCl=2FeCl3+3H2O ③Fe+CuCl2=Cu+FeCl2(2)H2O+Na2CO3+CO2 = 2NaHCO3(3)序号物质①②③④⑤液体HClHClHClHClHCl固体NaHCO3Na2CO3CaCO3FeNaOH(5组写全给2分,写出三组或三组以...