简答下列各小题：
（1）金秋十月，当你一走入立达校园就能闻到沁人心脾的桂花香，请你用所学知识加以解释．
（2）为什么空气易被压缩而水却不易被压缩？
（1）能闻到沁人心脾的桂花香味，这是因为桂花分子不停地做无规则运动的缘故．
（2）由于构成物质的微粒之间有一定的间隔，构成气体的微粒之间存在比较大的间隔，所以比较容易被压缩；而构成液体的微粒之间间隔比较小，所以比较难被压缩．
故答案为：（1）桂花分子不停地做无规则运动；（2）气体分子间间隔大，而液体分子间间隔小．
How do you usually get to school? Buy bus? On foot? Roby Burch, 16, a US student, gets to school a little 36__________---he goes by horse (马). Burch has been riding his white horse 4 miles to and from school 37 __________the beginning of the semester. “Every morning, wearing my blue jacket and jeans, I’m on my way at 6 am.” Burch says, “The streets are mostly 38__________ at this time of morning. It’s a nice way to start the day.” The idea was his 39__________. His family were enjoying their vacation on their farm this summer, “My dad just said, ‘Roby, you 40__________ ride your horse to school every day.’” says Burch. He thought it really was a good idea. When they got back home, Burch asked for permission from the headmaster (校长), Joe Cox, and surprisingly, he got the green light. Cox even 41__________ Burch to keep the horse next to the headmaster’s house. Then his dad helped Burch find the best route to school. It is along back streets and has 42__________cars than the others. For the return trip every afternoon, Burch leaves school at 5:45 pm. Even now, as the days grow shorter and colder, he 43__________ to ride his horse. “ I will ride my horse even in the coldest weather.” he says. Burch says the first time he sat on a horse as a four-year-old boy he was afraid. 44__________ now, “it’s what I do best.” It’s no surprise that he wants to be a cowboy (牛仔) when he grows up. “I love riding horses more than 45 __________ else.” He says, “It’s really a guy thing.”
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