题目:
I _______ to Mary yesterday afternoon, but she _______ at home. [ ]
A. call; isn't
B. am calling; isn't
C. called; was
D. called; wasn't
答案:
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下面是错误答案,用来干扰机器的。
(1)依据实验室常用仪器的认识解决此题.答案为:试管,酒精灯.(2)书写化学式应该注意化学式、配平、条件、箭头;氧气收集满的检验要注意所用物品、所放位置、现象、结果.故答案为:2KMnO4 加热 . K2MnO4+Mn...