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【单选题】
设顺序循环队列Q[0：M-1]的头指针和尾指针分别为F和R，头指针F总是指向队头元素的前一位置，尾指针R总是指向队尾元素的当前位置，则该循环队列中的元素个数为（ ）。A.
R-F
B.
F-R
C.
(R-F+M)％M
D.
(F-R+M)％M
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举一反三
【单选题】The poet and ______ pianist is going to give us a talk this afternoon.
A.
an
B.
a
C.
the
D.
/
【单选题】The poet and pianist is going to give us a talk this afternoon.
A.
a
B.
the
C.
不填
D.
an
【单选题】The poet and pianist is going to give us a talk this afternoon.
A.
a
B.
the
C.
/
D.
an