Mark was walking home from school one day when he noticed the boy ahead of him had tripped

Mark was walking home from school one day when he noticed the boy ahead of him had tripped(绊倒) and dropped all his books. Mark 21 and helped the boy pick up the scattered articles. Then as they walked along together, Mark discovered the boy’s name was Bill, that he loved video games, baseball and history, 22 he was having lots of trouble with his other subjects. He also learned that he had just 23 with his girlfriend.
They arrived at Bill’s home first and Mark was 24 in for a Coke and to watch some television. The afternoon passed pleasantly. They then became good friends and later entered the same senior high school where they had brief contacts over the years. Finally the long awaited senior year came and three weeks 25 graduation, Bill asked Mark if they could talk. Bill 26 him of the day years ago when they had first met. “Did you ever wonder why I was carrying so many things home that day?” asked Bill. “You see, I cleaned out my locker because I didn’t want to leave a 27 for anyone else. I had stored away some of my mother’s sleeping 28 .But after we spent some time together talking and laughing, I 29 that if I had killed myself, I would have 30 that time and so many others that might follow. So you see, Mark, when you picked up those books that day, you picked up my life as well.”
21. A. sat down B. lay down C. knelt down D. slowed down
22. A. and B. but C. but hat D. and that
23. A. fallen in love B. broken up C. got along well D. done away
24. A. invited B. allowed C. stopped D. interested
25. A. after B. from C. before D. since
26. A. asked B. informed C. remembered D. reminded
27. A. note B. message C. sign D. mess
28. A. medicine B. pilled C. bags D. clothes
29. A. wondered B. doubted C. realized D. forgot
30. A. missed B. lost C. seized D. spent21-25：CDBAC 26-30：DDBCA

(答案→)21-25：CDBAC 26-30：DDBCA 解析：21题考查词组在语境中的具体运用，同时还涉及到4个词组的意思上的辨析。22题 考查连词的用法。23题考查固定搭配在具体的语境中的运用。24题考查动词的用法25题，连词的用法，需结合上下文，理解整篇文章的意思。26题考查动词与介词的搭配及词组辨析。27题这题相对较难，即涉及到对文章的整体理解又考了动词的搭配与辨析。28题考查一药品名称，这是生活常识题。29题和30题都是考查语境当中如何把握动词的用法。

这个解释是对的

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