2/5, 11/18，6/21,7/8,26/27，()

A.18，9

B.12，8

C.12，6

D.18，6

A.1%-2%

B.2%-5%

C.5%-8%

D.8%-11%

A.1→2→3→5→8→10→11

B.1→2→4→7→9→10→11

C.1→2→4→6→8→10→11

D.1→2→3→5→8→9→10→11

A.8 5 2

B.／ 8 5 2

C.0 ／ 8 5 2

D.* 9 6 3 ．

A.2

B.5

C.8

D.11

1 2 3 4 7 6 ()

A . 11 B . 8 C . 5 D . 4

A.9

B.10

C.11

A.2%-5%

B.5%-8%

C.8%-11%

D.11%-14%