读下图,完成(1)—(2)题。(1)图示地区洪涝灾害多发的原因是( ) ①地势低洼,曲流多 ②季风气候,降水变率大 ③无天然入海河道,泄流不畅 ④众多支流汇集,洪峰叠加 A.①② B.②③ C.③④ D.①④ (2)该地采取的防洪工程措施是( ) A.深挖河道 B.修筑大堤 C.植树造林 D.退耕还湖.----I can’t find Jack. Where did you see him this morning?----It was in his factory _______he worked.A.whereB.which C.thatD.on which