省、自治区、直辖市人民政府防汛指挥机构根据( )规定汛期起止日期。
A.国家规定日期 B.险情发生前后C.当地规定日期 D.当地的洪水规律
参考答案:D
I wanted ______ basketball, but I ______ run fast.[ ]
A. play, could not
B. to play, can't
C. play the, can't
D. to play, could not
行×列χ2检验的专用公式是()
A.A
B.B
C.C
D.D
E.E