5,6,7,8,

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5,6,7,8,
5,6,7,8,

5,6,7,8,
ACCB

ACCB

5. A
6. C
7. C -5＜a＜-1
8. B

8,6,7,5,( ) ( ) 5,6,7,8, 5 6 7 8 5,6,7,8, 5,6,7,8, 5 6 7 8 5,6,7,8, 5,6,7,8, 5 6 7 8 5 6 7 8 5 6 7 8 5,6,7,8, 5,6,7,8, 5,6,7,8 5 6 7 8 5,6,7,8 5 6 7 8 5 6 7 8