A.i B.i-1 C.i+1 D.1
A.低 B.高 C.相同 D.不好說
A.3,4,5,1,2 B.2,4,1,3,5 C.3,5,4,2,1 D.1,3,5,2,4
A.4 B.5 C.6 D.7