题目

如图所示，2018年4月2日8时15分左右，天宫一号目标飞行器进入大气层，绝大部分器件在进入大气层过程中烧蚀销毁，剩余部分落入南太平洋中部区域。天宫一号飞行器在这个过程中，下列说法正确的是（ ） A . 动能和重力势能都增加 B . 机械能保持不变 C . 内能是通过做功的方式改变的 D . 减少的重力势能全部转化成内能根据短文内容及首字母提示，补全空格内单词，使短文完整、通顺（10分） We often hear people say, “Never give up.” A person who believes in this will k  96  trying to reach his goal no matter how many times he fails. In my opinion, i  97 you want to succeed ,you mustn’t give up. One reason is that it is usual for us to fail in our first try at s  98  new, so we should not feel disappointed and should try again. Besides, if we always give up when we fail, we will not be able to d  99  new skills. Another reason we should n 100   give up is that we can learn from our mistakes. If we do not try again, the k  101 we have learned is wasted . Finally, we should not give up because as we work to reach our goals, we have c  102  in ourselves, and it can help us succeed in other areas of our lives. In a word, it is i  103  that we do not give up when working for our goals. W 104  we succeed in the end or not, we will learn something, and what we learn will help us become b 105  and more confident.