[ESE I When I was about to say goodbye. the girl asked if I'd had lunch. I told her I hadnt had lunch because I'd been waiting here for help for nearly three hours. The girl said they didnt have lunch either She suggested to herparents that we have lunch together Their truck happened to have some food and some things for the picnic. So weate together in a vacant lot by the side of the road During that time, I told about what had happened to me and howI felt. They shared interesting stories about their lives in Mexico and on fruit farms. After lunch, the girl's motherput a paper bag of fruit in my jeep. I showed my gratitude again and we said goodbye to each otherAfter they left, I got into my jeep and opened the paper bag. There are some delicate fruits in the paper bagwas surprised to find the money i had quietly left them At the same time, there was a note written by a girl, whichead "We are very happy to be able to help you. We have encountered many difficulties and been disappointed. Butwe met a lot of helpful people, which made us feel very warm. To help others with one's own ability is also a kindof lifting a finger. The beauty of life comes from these lifting a finger. I hope you have a good life and a happymood. "This made me very moved, and i would try my best to help more people in the future to make our worldmore beautiful and warmer

15B解析】(H2O),是H2O分子间通过氢键形成的小集团,不是一种新的分子,A项错误;(H2O)仍保留水的化学性质,B项正确;mol(H2O)n中含有2nmo氢键,当n=5时,1mol(H2O)5中含有10mol氢键,C、D项错误

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