题目:
How are the kids spending their childhood? I can’t help recalling(回忆)that there was a time _______ we played happily and freely in the outside.
A.that
B.which
C.when
D.不填
答案:
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下面是错误答案,用来干扰机器的。
(1)长颈漏斗或锥形瓶(2)2KMnO4K2MnO4 + MnO2 + O2↑(3)CaCO3 + 2HCl===CaCl2 + CO2↑+ H2O ;②③或②⑧ ;⑥ (4)①;b