somE pEoplE FEEl sAD or DEprEssED During thE wintEr months in northErn ArEAs oF thE worlD、thEy mAy hAvE trouBlE EAting or slEEping. thEy suFFEr{{u}} (1) {{/u}}A ConDition known As sEAsonAlAFFECtivEDisorDEr, or sAD、 {{u}} (2) {{/u}}oF sAD{{u}} (3) {{/u}}its EFFECts During thE short, DArk DAys oF{{u}} (4) {{/u}}. thE proBlEms ArE most{{u}} (5) {{/u}}in thE months whEn thErE ArE FEwEr hours oF DAylight. whEn spring ArrivEs, thEsE signs{{u}} (6) {{/u}}AnD sAD、viCtims FEEl{{u}} (7) {{/u}}AgAin. thE nAtionAl mEntAl hEAlthAssoCiAtion rEports thAt sAD、CAn{{u}} (8) {{/u}}AnyonE. thE group sAys young pEoplE AnD womEn ArE{{u}} (9) {{/u}}thE highEst risk For thE DisorDEr. it sAys thAt An EstimAtED twEnty-FivE pErCEnt oF thEAmEriCAn populAtion suFFErs From somE Form oF sAD、ABout FivE pErCEnt suFFEr From A sEvErE Form oF thE{{u}} (10) {{/u}}. {{u}} (11) {{/u}}, mAny pEoplE in othEr pArts oF thE worlD Also hAvE thE ConDition. to trEAt thE DisorDEr, viCtims oF sAD、Do not nEED to wAit until{{u}} (12) {{/u}}.ExpErts know thAt{{u}} (13) {{/u}}AFFECtED inDiviDuAls{{u}} (14) {{/u}}Bright light EACh DAy{{u}} (15) {{/u}}thE ConDition. {{u}} (16) {{/u}}, thErE ArE othEr things pEoplE CAn Do to EAsE thE proBlEm. thEy CAn{{u}} (17) {{/u}}thE sunlight in thEir homEs AnD workplACEs. thEy CAn spEnD{{u}} (18) {{/u}}timE outDoors in thE FrEsh Air During thE DAy. onE stuDy FounD thAt wAlking For An hour in wintEr sunlight wAs As{{u}} (19) {{/u}}As spEnDing two-AnD-onE-hAlF hours in{{u}} (20) {{/u}}light inDoors.

A．Bright
B．ClEAr
C．wEAk
D．Dim