完形填空

    The summer vacation is the best time for students．They can go outdoors and have fun．They can go to big cities to  1，or go to the countryside to 2the beauty of nature(大自然)．

    Peter is an American middle school student and he loves 3  very much．He always travels in his country．

    This summer vacation he wants to do4．He is interested in Chinese history． 5he is flying to Beijing and Xi'an for the summer vacation．He is leaving on l2th July and 6 New York on the last day of the month．He plans 7 a fantastic vacation．During the 8，he is visiting places of interest and going shopping．At night，he is  9  to enjoy the night views．,He is sure he will have a  10 time．

分别阐述固态、液态和气态物质的特点．

虽然国家和社会为未成年人的健康成长提供了必要的条件和保护，但未成年人如果自我保护意识不强，仍会使自己的身心健康和合法权益受到损害。请问：未成年人应该如何增强自我防范意识？