北魏孝文帝实行改革，规定无论朝廷还是民间所有人必须讲汉语、穿汉服。[ ]
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The film The Founding of a Republic is wonderful because about 80 stars appear in it,
some of _____ are world - famous.[ ]
A. who
B. whom
C. them
D. those
影响物理风化的主要因素是（）
A.植物根系
B.气候
C.地形
D.温度
