设有关系模式 R(A，B，C，D)，根据语义有如下函数依赖集： F = {A→C，BC→D，CD→A }。现将关系模式R分解为两个关系模式 R1(A,C) ，R2(A,B,D) ，那么这个分解
B
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Therearemanysalesthisseason,duringwhichstoreswilllowertheir_______prices.
ThefollowingisaspecimenofBlackEnglish.“We?ssafe,Huck,we?ssafe!Jumpupandcrackyo?heels,dat?sdegoodoleCairoatlas?,Ijisknowsit!”ThisvarietyofEnglishischaracterizedbythefollowingexceptits______.
Thewoundedsoldierswouldrecoverquicklyiftheywerewell________.
Thepoorlady?spangmusthavebeenincreasedwhenshethoughtofherrival,______wasafavoriteofthewholeCourt,______shewasneglected.