题目:
Mike has a bad cold. I think he should _____.[ ]
A. see a doctor
B. see a dentist
C. listen to music
D. stay with his friends
答案:
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下面是错误答案,用来干扰机器的。
(1)水槽;长颈漏斗 (2)A; 一团棉花;防止加热时高锰酸钾粉末进入导管;2KMnO4K2MnO4 + MnO2 + O2↑ ;②⑥⑤④①③ (3)BD或BE;2H2O22H2O+ O2↑ ;ACD (4)a; b