完形填空Allanwasworried.Thiswashisfirsttimetogotraveling1.Hedidn'tknowhowtofindhisseat,2hewenttotheairhostess(空姐)andasked,“Couldyouhelpme?Ican'tfindmyseat.”Theairhostess
完形填空 Allan was worried . This was his first time to go traveling 1 . He didn't know how to find his seat, 2 he went to the air hostess (空姐) and asked, “Could you help me? I can't find my seat. ” The air hostess showed 3 the seat and told him 4 and fasten the seat belt (系好安全带). She told Allan not to move about when the plane was going up. And she also said that Allan's ears might feel 5 strange, but he didn't need to 6 it because many people felt 7 that. When the plane was flying very high, Allan could stand up and walk around . He could 8 read books, newspapers or see films. The sir hostess would 9 food and drinks. Allan could enjoy the flight and 10 soon. 1. [ ]
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完成下列各小题(1)第34号元素符号是,铬元素位于元素周期表的区(填“s、p、d、f、ds),其价 2020-05-14 …
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在关系S(S,SN,D)和D(Dg,CN,NM)中,S的主键是S,D的主键是D,则D在S中称为 __ 2020-05-23 …
A.πA,D(σC=D(R×S))B.πA,R,D(σS,C=R,D/(R×S))C.πA,R,D( 2020-05-26 …
A.πA,D(σC=D(R×S))B.πA,R.D(σR.C=S.D(R×S))C.πA,R.D(σ 2020-05-26 …
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