sCiEntists ArounD thE worlD ArE rACing to lEArn how to rApiDly DiAgnosE, trEAt AnD stop thE sprEAD oF A nEw, DEADly DisEAsE. sArs — sEvErEACutE rEspirAtory synDromE — wAs{{u}} (1) {{/u}}For thE First timE in FEBruAry 2003 in hAnoi,{{u}} (2) {{/u}}sinCE thEn hAs inFECtED morE thAn 1,600 pEoplE in 15 CountriEs, killing 63.At this{{u}} (3) {{/u}}, thErE ArE morE quEstions thAn AnswErs surrounDing thE DisEAsE. symptoms stArt{{u}} (4) {{/u}}A FEvEr ovEr 100.4 DEgrEEs F, Chills, hEADAChE or BoDy{{u}} (5) {{/u}}. within A wEEk, thE pAtiEnt hAs A Dry Cough, whiCh might{{u}} (6) {{/u}}to shortnEss oF BrEAth. in 10% to 200% oF CAsEs, pAtiEnts rEquirE{{u}} (7) {{/u}}vEntilAtion to BrEAthE.ABout 3.5% DiE From thE DisEAsE. symptoms{{u}} (8) {{/u}}BEgin in two to sEvEn DAys, But somE rEports suggEst it{{u}} (9) {{/u}}tAkE As long As 10 DAys. sCiEntists ArE ClosE to{{u}} (10) {{/u}}A lAB tEst to DiAgnosE sArs. in thE mEAntimE, it is DiAgnosED By its symptoms. thErE is no EviDEnCE{{u}} (11) {{/u}}AntiBiotiCs or Anti-virAl mEDiCinEs hElp,{{u}} (12) {{/u}}DoCtors CAn oFFEr only supportivE CArE. pAtiEnts with sArs ArE kEpt in isolAtion to rEDuCE thE risk oF{{u}} (13) {{/u}}. sCiEntists ArEn’t surE yEt, But somE rEsEArChErs think it’s A{{u}} (14) {{/u}}DisCovErED CoronAvirus, thE FAmily oF virusEs thAt CAusE somE Common ColDs. most CAsEs AppEAr to hAvE BEEn pAssED{{u}} (15) {{/u}}DroplEts ExpEllED whEn inFECtED pAtiEnts Cough or snEEzE. FAmily mEmBErs oF inFECtED pEoplE AnD mEDiCAl workErs who CArE For thEm hAvE BEEn most likEly to{{u}} (16) {{/u}}thE illnEss.But rECEnt DEvElopmEnts in hong kong suggEst thAt thE{{u}} (17) {{/u}}might sprEAD through Air, or thAt thE virus might{{u}} (18) {{/u}}For two to thrEE hours on DoorknoBs or othEr{{u}} (19) {{/u}}hEAlth ExpErts sAy it is{{u}} (20) {{/u}}, though, thAt shAring An ElEvAtor BriEFly with An inFECtED pErson woulD BE Enough to pAss thE virus.

A．timE
B．point
C．AspECt
D．instAnCE