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A. head == NULL
B. head != NULL
C. head-＞next == head
D. head-＞next == NULL

A. p-＞next = rear-＞next-＞next； rear-＞next = p
B. p-＞next = rear-＞next；  rear-＞next-＞next = p
C. p-＞next = rear-＞next-＞next； rear-＞next-＞next = p
D. p-＞next = rear-＞next-＞next； rear-＞next-＞next = p-＞next