Nooneknowsexactly（71）___theearthbegan．Accordingtoawidelyacceptedtheory，theearthbeganwithaamp;quot;BigBangamp;quot;，（72）___explodedloudlyandproducedwatervaporandmanygases，（73）___（make）theearth#39;satmo

问题：Nooneknowsexactly（71）___theearthbegan．Accordingtoawidelyacceptedtheory，theearthbeganwithaamp;quot;BigBangamp;quot;，（72）___explodedloudlyandproducedwatervaporandmanygases，（73）___（make）theearth#39;satmosphere

答案：↓↓↓

何小娟的回答：

网友采纳　　71．how；考查疑问词，分析句意为"没有人确切地知道地球是如何产生的"，故用疑问副词how．72．which；考查关系代词，分析句子可知这是一个非限制性定语从句，关系代词which指代前一句提到的事情．73．makin...