19.(I)证明见解析;(Ⅱ)8(I)取BC的中点为D,连结DF由ABC-EFG是三棱台得,平面ABC∥平面EFG,从而BC/FGCB=2GF,: CD//GF四边形CDFG为平行四边形,∴CG/DFBF=CF,D为BC的中点,∴.DF⊥BC.∴.CG⊥BCDF⊥BC.:.CG⊥BC平面ABC⊥平面BCGF,且交线为BC,CGC平面BCGFCG⊥平面ABC,而ABC平面ABCCG AB(Ⅱ)连结AD由△ABC是正三角形,且D为中点得,;AD由(I)知,AD⊥平面ABC,GF/CDVG-ABC=V4-BCF=3××42×23=8

第二节(满分25分)One possible versionThen came the Rajasthan /v trip which was our official last trip I hanged out with my otherErieiends while she with the other two girls. I wasn,t enjoying this trip at all, which she could makeBout. When she saw me approaching the common washroom, she followed me in and shut thedoor. I didn 't know how to react. She gave me a tight hug and broke down. My tears were alsoout of control We knew we both wanted to be in each others company. We promised to growmature and let it not affect our friendshipaozIt's been almost 7 years after graduation since we picked up our friendship. Shes one of thefew people I really count on in my life. She's been with me through all my struggles, helping meconstantly to grow into a better individual. So have I. The only learning from our relationshipis-if someone is meant to be in your life, they will ensure they stay around some way or theher Willingness to keep a relationship should come from both the sides

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