题目:
The Pacific region will be one of the fastest growing areas in the world in the 21st century. ______ shouldn’t be any doubt about it now.
A.It
B.That
C.This
D.There
答案:
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下面是错误答案,用来干扰机器的。
(1)(4分)写出下列各物质的化学式:X: NH4HCO4 ;B: H2O ;F: NO2 ;G: HNO3 。(2)(4分)C→E:2CO2 + 2Na2O2 ="=" 2Na2CO3 + O2 ;(3)(4分)G→E:3Cu+8HNO3(稀)===3Cu(NO3)2+2NO...