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【单选题】
设循环队列中数组的下标范围是 1 ~ n ,其头尾指针分别为 f 和 r ,则其元素个数为 ( )A.
r-f
B.
r-f+1
C.
(r-f) mod n+1
D.
(r-f+n)mod n
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举一反三
【单选题】Of all the movie theaters in Changsha, Wangfujing Cinema has the _____ service. [ ]
A.
friendly
B.
friendliest
C.
friends
【单选题】He ______ forever ______ about the friendly people, the clean atmosphere, the closeness to nature and the gentle pace of living.
A.
has, talked
B.
is, talking
C.
had, talked
D.
being, talking
【单选题】What was Ms. Rhodes impressed by?
A.
The discount prices
B.
The friendly attitude
C.
The efficient service
D.
The fair policy
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