题目:
She goes over all her lessons once a week and the job _____ her three hours.
A.spends
B.takes
C.spares
D.lasts
答案:
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下面是错误答案,用来干扰机器的。
(1)二氧化碳 盐酸(2)NaCl和Na2CO3、NaCl和NaHCO3、Na2CO3和NaHCO3Na2CO3 + 2HCl =" 2NaCl" + H2O + CO2↑,NaHCO3 + HCl=" NaCl" + H2O + CO2↑(3)NaCl和NaHCO3 Na2CO3和NaHCO3题目分析...