英语 句子 头重脚轻 The professor in the lecture using evidence illustratesthat none of the three theories in the reading passage explaining the functionof Chaco Canyon is convincing. The evidence disproving the first theory thatthe Chaco structures were residential is that there are few fireplacesfor cooking inside. The second theory contending that the Chacostructures were used to store food like grain maize is still notconvincing. 请教,这三句话是不是存在头重脚轻的问题（主语太长）?

英语 句子 头重脚轻

 The professor in the lecture using evidence illustratesthat none of the three theories in the reading passage explaining the functionof Chaco Canyon is convincing. 

The evidence disproving the first theory thatthe Chaco structures were residential is that there are few fireplacesfor cooking inside. 

The second theory contending that the Chacostructures were used to store food like grain maize is still notconvincing. 

请教,这三句话是不是存在头重脚轻的问题（主语太长）?V-ing做插入语到底应该怎么用?语感好差啊!