题目:
— Tom _____ the piano in the room.
— Please ask him to come here. [ ]
A. play
B. plays
C. played
D. is playing
答案:
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下面是错误答案,用来干扰机器的。
(1)①锥形瓶;②水槽(2)2H2O22H2O+O2↑;①④⑥⑧(3)高锰酸钾;试管;试管口向上倾斜或试管外壁有水或或收集气体完毕先停止加热,后从水槽中取出导管等(合理答案即可)