题目

分类是学习和研究物质及其变化的一种常用方法。分类要有一定的标准，如果按照物质的组成对空气、氯酸钾、氮气、烧碱、二氧化锰五种物质进行分类，请将物质的分类结果填写在下面的虚线框内(要求纯净物用化学式表示) 答案：解析:略 完形填空 　　One can have many experiences, but the one I never forget is my bicycling trip in Taiwan．When we were going to 　　1　　 school, my teacher suggested that we could do something special to remember our school life．After a long discussion, we decided to travel 　　2　　 the whole island by bicycle． 　　We began to get some training to make our 　　3　　 stronger．So we ran 3,000 meters after school．At first, I could only run about 2,000 meters．My legs were heavy like steel and my heart 　　4　　 very fast．After two weeks of training, I could run 3,000 meters 　　5　　． 　　We started our journey(旅行)the last week of July．We rode about 100 kilometers 　　6　　．It was very hot and our clothes were 　　7　　 all the time．One day, we were riding up the mountain when there was 　　8　　 wrong with my bicycle, and I fell and was hurt．I almost gave up and didn't want to 　　9　　 the trip, but I tried to solve the problems successfully and kept on．Fifteen days passed, we returned to school again．We were so 　　10　　．This experience was like a miracle(奇迹)for me．I learned that I could do what I want to． (1) [　　] A． leave B． pass C． enter D． choose (2) [　　] A． toward B． along C． from D． around (3) [　　] A． arm B． heart C． body D． leg (4) [　　] A． ran B． beat C． hurt D． broke (5) [　　] A． safely B． easily C． luckily D． pleasantly (6) [　　] A． every day B． every week C． every month D． every year (7) [　　] A． wet B． dry C． clean D． dirty (8) [　　] A． nothing B． anything C． everything D． something (9) [　　] A． miss B． continue C． stop D． begin (10) [　　] A． surprised B． worried C． excited D． interested