Look at me. This is my          .

两物体从不同高度自由下落,同时落地.第一个物体下落时间为t,第二个物体下落时间为$\frac{t}{2}$.当第二个物体开始下落时,两物体相距（   ）

（Ⅰ）根据频率分布直方图，估计该校高三学生本次数学考试的平均分；

（Ⅱ）若用分层抽样的方法从分数在30，50）和130，150）的学生中共抽取3人，该3人中分数在130，150）的有几人？

（Ⅲ）从（Ⅱ）中抽取的3人中，随机抽取2人，求分数在30，50）和130，150）各1人的概率．

完形填空

    Where do you go when you want to learn something? A friend? A tutor? These are all 1places of learning. But it may well be that the learning you really want 2somewhere else instead. I had the3 of seeing this first hand on a 4.

    My daughter plays on a recreational soccer team. They did well this season and so5 a tournament, which normally was only for more skilled club teams. This led to some6experiences on Saturday as they played against teams 7 trained. Through the first two games, her8 did not get one serious shot on goal. As a parent, I9 seeing my daughter playing her best, 10still defeated.

    It seemed that something clicked with the 11 between Saturday and Sunday. When they 12for their Sunday game, they were 13 different. They had begun to integrate (融合) the kinds of play and teamwork they had 14the day before into their15 . They played aggressively and 16scored a goal.

    It 17me that playing against the other team was a great 18 moment for all the girls on the team. I think it is a general principle. 19is the best teacher. The lessons they learned may not be20what they would have gotten in school, but are certainly more personal and meaningful, because they had to work them out on their own.