帮忙改一下小弟这篇托福综合写作作文~
Theauthorbelievesthatthe''swampgas''hypothesisfaroutweighsthe"outerobject"explanation.However,thelecturehasatotallydifferentideaonthetopicmadeinthereading.
Thefirstpointthelecturerusestocastdoubtonthereadingisthattheabsenceoffragmentonearthcannotsupporttheideathattheexplosionwasnotcausedbyanouterspaceobject.Theauthorisconvincedthatiftheaccidentwascausedbyanasteroid,theremustbeahugecrateronthesurfaceoftheground,yetnotracesarefoundinthearea.However,thespeakerpointsoutthatafter90years'ofnaturalchanges,thetracescanbeeliminatedcompletedly.
Inthesecondplace,thereadingmadethepointthattheabsenceofhugecratershasweakenedthetheorytosomeextend.Tothecontrary,thespeakerstatesthattheasteroidcouldexplodebeforeitreachedtheground,soitisquitereasonabletofindnothingaftertheexplosion.
Lastly.thelecturerenhancedherstandpointbyaddingthefactthatthewholeprocesscaninvolvealargeareainsteadjustonespot,whichisnotanticipatedthetheauthor.
Inconclusion,thepassaggecompletelyrefusesthereading.