下面这段一般疑问句的作用是什么?
HadhecalledanyoneatMackayEnvelopeCorporationtofindoutmoreaboutus?No.Hadhecalledoursuppliers?Ourcustomers?No.
HadhecheckedwithhisuniversitytoseeiftherewereanygraduatesworkingatMackaywhomhecouldinterview?Hadheaskedanyfriendstogrillhiminamockinterview?Didhegotothelibrarytofindnespaperlippingsonus?
Didhewritealetterbeforehandtotellusabouthimself,whathewasdoingtopreparefortheinterviewandwhyhe'dberightforthejob?Washeplanningtofollowuptheinterviewwithanotherletterindicatinghiseagernesstojoinus?Wouldtheletterbeinourhandswithin24hoursofthemeeting,possiblyevenhad-delivered?