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加密是把数据转换成不可读的形式，并在必要时再转换回来，以保证只有______才能阅读该信息。

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There are many kinds of friends. Some are always ( 1 ) you, but don’t understand you. Some say only a few words to you, but understand you. Many people will step in your life, but only ( 2 )friends leave footprints. I shall always recall the autumn and the girl with the ( 3 ). She will always bring back the friendship between us. I know she will always be my best friend. It was the golden season. I could see the yellow leaves ( 4 )with the cool ( 5 ). In such a season, I liked walking alone on the roads covered with leaves, ( 6 )to the sound of them. Autumn is a ( 7 )season and life is uninteresting. The free days always get me ( 8 ). But one day, the sound of a violin ( 9 )into my ears like a stream flowing in the mountains. I was so surprised that I jumped to see what it was. A young girl, standing in the wind, was ( 10 )in playing her violin. I had ( 11 )seen her before. The music was so nice that I listened quietly. Lost in the music, I didn’t know that I had been ( 12 )there for so long but my existence did not seem to disturb her. Leaves were still falling. Every day she played the violin at the corner of the building ( 13 )I went downstairs to watch her performance. I was the only listener. The autumn seemed no longer lonely and life became ( 14 ). ( 15 )we didn’t know each other, I thought we were already good friends. I believe she also loved me. Autumn was nearly over. One day, when I was listening carefully, the sound suddenly ( 16 ). To my astonishment, the girl came over to me. “You must like music from the violin.” she said. “Yes. And you play very well. Why did you stop” I asked. Suddenly, a ( 17 )expression appeared on her face and I could feel something unusual. “I came here to see my grandmother, but now I must leave. I once played very badly. It was your listening every day that ( 18 )me.” she said. “In fact, it was your playing ( 19 )gave me a meaningful autumn,” I answered, “Let’s be friends.” The girl smiled, and so did I. I never heard her play again in my life. I no longer went downstairs to listen to her. Only thick leaves were left behind. But I will always remember the fine figure (身影) of the girl. She is like a ( 20 )―so short, so bright, like a shooting star giving off so much light that makes the autumn beautiful.

A. song
B. dream
C. fire
D. sister

阅读以下说明和流程图，回答问题将解答填入对应栏。 [说明] 本流程图采用“双向冒泡法”实现对数组a[n]的排序。双向冒泡法就是在逐步缩小的数组内，分别从数组的两端开始向内搜索，同时将大数往上浮，小数往下沉，每次交换一组数。flag是一个标志，发生过交换就置为1，当这个循环过程都不再发生交换时，则数组排序完成。注：流程中循环开始的说明按照“循环变量：循环初值，循环终值，增量”格式描述；定义swAP[a,b]为将a和b两数交换。 [问题] 将流程图的(1)～(5)处补充完整。

Directions: At present, much attention is being attached to the environmental protection. Write a letter to advocate car-pooling. And in your letter, you should at least state the aim of your writing and the advantage(s) of car-pooling. You should write about 100 words on ANSWER SHEET 2. Do not sign your own name at the end of the letter. Use "Li Ming" instead. You do not need to write the address.