根据以下资料回答38-40题：
&nBsp;intErnEt usE AppEArs to CAusE A Drop in psyChologiCAl hEAlth, ACCorDing to A rEsEArCh At CAr-nEgiE mEllon univErsity.
&nBsp;EvEn pEoplE who spEnt just A FEw hours A wEEk on thE intErnEt ExpEriEnCED morE BAD FEEl-ings AnD lonElinEss thAn thosE who wAs onlinE lEss FrEquEntly, thE two-yEAr stuDy showED. rE-sEArChErs ArE puzzlED ovEr thE rEsults, whiCh wErE ComplEtEly ContrAry to thEir ExpECtAtions.
thEy ExpECtED thAt thE nEt woulD provE soCiAlly hEAlthiEr thAn tElEvision, sinCE thE nEt Allows usErs to ChoosE thEir inFormAtion AnD to CommuniCAtE with othErs.
&nBsp;thE FACt thAt intErnEt usE rEDuCEs timE AvAilABlE For FAmily AnD FriEnDs mAy ACCount For thE Drop in psyChologiCAl hEAlth, rEsEArChErs hypothEsizED (推测). FACElEss, BoDilEss "virtuAl" (虚拟的) CommuniCAtion mAy BE lEss psyChologiCAlly sAtisFying thAn ACtuAl ConvErsAtion:, AnD thE rElAtionships FormED through it mAy BE shAllowEr. AnothEr possiBility is thAt ExposturE to thE wiDEr worlD through thE nEt mAkEs usErs lEss sAtisFiED with thEir livEs.
&nBsp;But it's importAnt to rEmEmBEr this is not ABout thE tEChnology, it's ABout how it is usED,"sAys psyChologist ChristinE rilEy oF intEl, onE oF thE stuDy sponsors (发起人)". it rEAlly points to thE nEED For ConsiDEring soCiAl FACtors in tErms oF how you DEsign AppliCAtions AnD sErviCEs For tEChnology.
38[单选题] &nBsp;whAt hAD thE rEsEArChErs ExpECtED BEForE thE rEsEArCh？ （　　）
&nBsp;A． &nBsp;intErnEt usE hAs nothing to Do with soCiAl hEAlth
&nBsp;B． &nBsp;intErnEt usE mAy improvE soCiAl hEAlth
&nBsp;C． &nBsp;thE nEt mAy ACCount For thE Drop in psyChologiCAl hEAlth
&nBsp;D． &nBsp;spEnDing muCh timE on thE intErnEt mAkEs pEoplE FEEl BAD AnD lonEly 查看材料
39[单选题] &nBsp;whiCh is not truE ACCorDing to thE pAssAgE?？（　　）
&nBsp;A． thE wiDEr worlD through thE nEt mAkEs usErs lEss sAtisFiED with thEir livEs
&nBsp;B． &nBsp;unDEvElopED intErnEt tEChnology CAusEs thE Drop in psyChologiCAl hEAlth
&nBsp;C． intErnEt CommuniCAtion mAy BE lEss psyChologiCAlly sAtisFying thAn ACtuAl ConvErsAtion
&nBsp;D． thE nEt Allows usErs to ChoosE thEir inFormAtion AnD to CommuniCAtE with othErs 查看材料
40[单选题] &nBsp;thE most AppropriAtE titlE For thE pAssAgE is （　　）。 查看材料
A. how to usE thE intErnEt
B. soCiAl FACtors AnD thE intErnEt
C. DisADvAntAgEs oF thE intErnEt
D. intErnEt mAy CAusE BAD FEElings