如图所示，一个水平方向上做简谐运动的弹簧振子，向右通过平衡位置O与向左通过平衡位置O时，不相同的物理量是（　　）

一个多项式加上3y²﹣2y﹣5得到多项式5y³﹣4y﹣6，则原来的多项式为（   ）

某饮用水标签行的部分文字如图，请回答：

（1）这里的钙、镁、钾指的是____ （选填：原子、分子或元素）．

（2）钠原子的结构示意图是，其中x=____ ．

2016年9月29日，四川一学校因老师不同意学生提前离校，7名学生到教室殴打老师，还有学生在门口摄像。老师从头至尾没有还手。派出所接到报警后，打人者因未满16岁被家长带走，没有道歉。以下说法正确的是（    ）

①这7名学生应该合理调控自己的情绪    ②不合理的情绪表达有时会触犯法律

③有了情绪就要发泄出来                          ④情绪无法调控

    One of the most famous scientists to study adaptations(适应能力) was Charles Darwin(达尔文). He was born in England in 1809. He wasn't the best student in his school, but when he was 16, his father sent him to a medical school. Charles liked spending time outdoors observing(观察) nature more than having medical classes. He dropped out without graduating.
    Next, Charles' father sent him to school to become a minister(牧师). This time he made it to graduation, but he didn't want to do the work of a minister. His friends encouraged him to follow his interest in science.
    Luckily, Charles was invited to sail on the Beagle as an unpaid scientist after graduation. The Beagle was to travel to South America and then around the world. Their task was to make maps of the places they visited.
    On December 27th, 1831. Charles Darwin sailed from England on the Beagle. The trip was planned to last two years. In fact, it lasted five. During this time, he saw many amazing things. He collected lots of plants and animals and took them back to England to begin his scientific study.
    Twenty-three years later, Darwin published a scientific paper with another man named Wallace. Darwin described how some animals have adaptations that help them survive. They are passed on to offspring(后代). Darwin's ideas about adaptations are still very important to the study of living things.