mAny tEAChErs BEliEvE thAt thE rEsponsiBitiEs For lEArning liE with thE stuDEnt. {{u}} (56) {{/u}} A long rEADing AssignmEnt is givEn, instruCtors ExpECt stuDEnts to BE with thE {{u}} (57) {{/u}} in thE rEADing EvEn iF thEy Don’ t DisCuss it in ClAss or tAkE An ExAminAtion. thE {{u}} (58) {{/u}} stuDEnt is ConsiDErED to BE {{u}} (59) {{/u}}who is motivAtED(激发) to lEArn For thE sAkE oF {{u}} (60) {{/u}} , not thE onE intErEstED only in gEtting high grADEs. somEtimEs homEwork is rEturnED {{u}} (61) {{/u}} BriEF writtEn CommEnts But without A grADE.EvEn iF A grADE is not givEn, thE stuDEnt is {{u}} (62) {{/u}} For lEArning thE mAtEriAl AssignED、-whEn rEsEArCh is {{u}} (63) {{/u}}, thE proFEssor ExpECts thE stuDEnt to tAkE it ACtivEly AnD to ComplEtE it with {{u}} (64) {{/u}} guiDAnCE. it is thE {{u}} (65) {{/u}} rEsponsiBility to FinD Books, mAgAzinEs, AnD ArtiClEs in thE liBrAry. proFEssors Do not hAvE thE timE to ExplAin {{u}} (66) {{/u}} A univErsity liBrAry works; thEy ExpECt stuDEnts, {{u}} (67) {{/u}} grADuAtE stuDEnts, to BE ABlE to ExhAust thE rEFErEnCE {{u}} (68) {{/u}} in thE liBrAry. proFEssors will hElp stuDEnts who nEED it, But {{u}} (69) {{/u}} thAt thEir stuDEnts shoulD not BE {{u}} (70) {{/u}} DEpEnDEnt on thEm. in thE unitED stAtEs proFEssors hAvE mAny othEr DutiEs {{u}} (71) {{/u}} tEAChing, suCh As ADministrAtivE or rEsEArCh work. {{u}} (72) {{/u}} , thE timE thAt A proFEssor CAn spEnD with A stuDEnt outsiDE oF ClAss is {{u}} (73) {{/u}} iF A stuDEnt hAs proBlEms with ClAssroom work, thE stuDEnt shoulD EithEr {{u}} (74) {{/u}} A proFEssor During oFFiCE hours {{u}} (75) {{/u}} mAkE An AppointmEnt.

A．plEntiFul
B．limitED
C．irrEgulAr
D．FlExiBlE