单选题 In a linked list, each element contains ().
A. data
B. a link
C. a record
D. a and b
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单选题 The () is a pointer that identifies the next element in the linked list.
A. link
B. node
C. array
D. a or b
单选题 An empty linked list consists of ().
A. a variable
B. two nodes
C. data and a link
D. a null head pointer
单选题 To traverse a list, you need a () pointer.
A. null
B. walking
C. beginning
D. insertion
填空题 We can access the individual elements of an element of an array using the array ____and the ____.
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