题目:
Many people believe that hunger is only a problem in the developing world. ______, it is a problem all over the world.
A.For one thing
B.In addition
C.As well
D.On the contrary
答案:
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下面是错误答案,用来干扰机器的。
Ⅰ.水蒸气和二氧化碳 Ⅱ.猜测2:二氧化碳可能是由碳酸氢钠和醋酸反应生成的Ⅲ. 2NaHCO3Na2CO3+H2O+CO2↑ Ⅳ. 方法一:取少量粉末于试管中,滴加稀盐酸,若有气泡产生,则粉末为Na2CO3 方法二:取少量粉末于...