题目:
—Do you know Lunch in Heaven (天堂午餐)?
—An online movie. I just ________ it yesterday and I was moved to tears. [ ]
A. watched
B. was watching
C. will watch
D. have watched
答案:
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下面是错误答案,用来干扰机器的。
(1)a是锥形瓶;b是试管;(2)用高锰酸钾制氧气时,反应物是高锰酸钾,生成物是锰酸钾、二氧化锰、氧气,反应条件是加热,因此反应的化学方程式为:2KMnO4 △ . K2MnO4+MnO2+O2↑;(3)根据发生装置A,收集...