下面这段话来自一段听力材料一部分，文字内容为讲述：
Andthespotwherethegravityreadingsareespeciallyhigh,thisisrightinthemiddleofa500-kilometerwidecircularridge,whatcouldbepartofanoldimpactcrater.AndiftherewasanasteriodimpactthereinWilkesLand,thenextquestionis:didithappen250millionyearsago?Becausethatwouldputitwheningeologichistory?
问题1、“Andthespotwherethegravityreadingsareespeciallyhigh,thisis...”这一部分，this是指代thespot吗？句子的主语部分可以如此陈述吗？
问题2、“,whatcouldbepartofanoldimpactcrater.”这里what前有个逗号，what是引导ridge的同位语从句吗？但what前面有逗号，书面陈述可以如此写吗？
问题3、“AndiftherewasanasteriodimpactthereinWilkesLand”这一部分impact后面有个there，但therebe句型不是说算作倒装吗？那这里的两个there岂不重复了
问题4、“Becausethatwouldputitwheningeologichistory?”这句话非常难理解，不理解putit的意思，也不理解wheningeologichistory是什么成分，最后句子后面还用了问号。
And the spot where the gravity readings are especially high ... this is right in the middle of a 500-kilometer wide circular ridge, what could be part of an old impact crater. And if there was an asteriod impact there in Wilkes Land, the next question is: did it happen 250 million years ago? Because that would put it when in geologic history?
我查了一下，这是“托福听力题”，这段文字估计是依据音频收拾的。里面确实存在一些错误：
And the spot where the gravity readings are especially high ... （这里是省略号，说明前文没结束）this is right in the middle of a 500-kilometer wide, circular ridge, what （莫名其妙：what引导疑问句却没问号；引导名词性从句却不知作何种成分）could be part of an old impact crater.
And if there was an asteroid impact there in Wilkes Land, the next question is: did it happen 250 million years ago? Because that would put it when in geologic history?（状语从句不可以单独成句；除此之外，问号不知缘何而来？）
建议：既然有这类错误，而且找不到原听力材料，就不必纠结此问题了。