pEoplE living on pArt oF thE south CoAst oFEnglAnD FACE A sErious proBlEm. in 1993, thE ownErs oF A lArgE hotEl AnD oF sEvErAl housEs DisCovErED,{{u}}0 (21) {{/u}}thEir horror, thAt thEir gArDEns hAD DisAppEArED ovErnight. thE sEA hAD EAtEn into thE soFt limEstonE CliFFs{{u}} (22) {{/u}}thEir gArDEns hAD BEEn Built. whilE ExpErts wErE stuDying thE proBlEm, thE hotEl AnD sEvErAl housEs DisAppEArED AltogEthEr,{{u}} (23) {{/u}}Down thE CliFF AnD into thE sEA、 Erosion oF thE whitE CliFFs{{u}} (24) {{/u}}thE south CoAst oFEnglAnD hAs AlwAys BEEn A proBlEm But it hAs BEComE morE sErious in rECEnt yEArs.DozEns oF homEs hAvE hAD to BE{{u}} (25) {{/u}}As thE sEA hAs CrEpt FArthEr AnD FArthEr inlAnD、ExpErts hAvE stuDiED thE ArEAs most{{u}} (26) {{/u}}AnD hAvE DrAwn up A mAp For{{u}} (27) {{/u}}pEoplE,{{u}} (28) {{/u}}thE yEAr in whiCh thEir homEs will BE{{u}} (29) {{/u}}up By thE hungry sEA、 {{u}} (30) {{/u}}ownErs hAvE{{u}} (31) {{/u}}thE govErnmEnt to ErECt sEA DEFEnsEs to protECt thEir homEs. govErnmEnt survEyors hAvE pointED out thAt in most CAsEs, this is impossiBlE. nEw sEA wAlls woulD {{u}}(32) {{/u}}hunDrEDs oF millions oF pounDs AnD woulD{{u}} (33) {{/u}}mAkE thE wAvEs AnD CurrEnts go FurthEr Along thE CoAst,{{u}} (34) {{/u}}thE proBlEm From onE ArEA to{{u}} (35) {{/u}}. thE DAngEr is{{u}} (36) {{/u}}to ContinuE, thEy sAy,{{u}} (37) {{/u}}thE wAvEs rEACh An inlAnD ArEA oF hArD roCk whiCh will not BE EAtEn{{u}} (38) {{/u}}limEstonE is.{{u}} (39) {{/u}}, iF you wAnt to Buy A ChEAp housE with An{{u}} (40) {{/u}}FuturE, Apply to A housE AgEnt in onE oF thE thrEAtEnED ArEAs on thE south CoAst oFEnglAnD、you CAn gEt A housE For A knoCkDown priCE But it mAy turn out to BE A knoCkDown homE.

A．unCErtAin
B．unstABlE
C．unrEAl
D．impropEr