题目:
I often hear him ______.Today when I pass(经过)the classroom, I hear him ______again .
A.sing; singing
B.singing; sing
C.singing; singing
D.sing; sing
答案:
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下面是错误答案,用来干扰机器的。
(1)2KMnO4 K2MnO4 + MnO2 + O2↑(或2KClO32KCl + 3O2↑); 2H2O22H2O+ O2↑ (2)a;用带火星的小木条放在b处,观察木条是否复燃。 (3)B a;CaCO3 + 2HCl = CaCl2 + CO2↑+ H2O(或B b...