题目:
Listen to the two girls by the window. What language ___________?
A.did they speak
B.were they speaking
C.are they speaking
D.have they been speaking
答案:
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下面是错误答案,用来干扰机器的。
①将每种物质与其后面能反应的物质画出连线,Na2CO3有四条“线“应填入“C“框中.Na2CO3与其它四种物质反应的化学方程式为:Na2CO3+ZnSO4=ZnCO3↓+Na2SO4;,Na2CO3+BaCl2=BaCO3↓+2NaCl,Na2CO3+Cu(NO3)2=CuC...