题目:
—Mr Green, ____ you _____ Three Lanes and Seven Alleys (三坊七巷) last Sunday?
—No, but I'll visit them next week. [ ]
A. will; go to
B. have; been to
C. did; go to
D. have; gone to
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,a是长颈漏斗,b是锥形瓶.故答案为:长颈漏斗;锥形瓶;(2)B装置属于“固液常温型”制取氧气,可用过氧化氢和二氧化锰制取氧气,反应符号表达式是2H2O2 MnO2 . 2H2O+O2...