题目内容

news report 2

A. The darkness and cold.
B. The heavy snow and fog.
C. The biting winds.
D. The ice all around.

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fill in the blanks with the right choice.

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Add proper suffixesto these words and form new words.please choose the best answer.

用数组Ｑ[ｎ] 表示一个循环队列，ｆ为当前队头元素的位置，ｒ为队尾元素的下一个位置，计算队列中元素个数的公式为

A. r－f
B. （f－r＋n）% n
C. r－f＋n
D. （r－f＋n）% n