过去人们普遍认为，健康就是没有生病或者体质健壮，后来又认识到心理健康也是健康的重要内容。世界卫生组织对健康做出了定义：“健康不仅仅是身体没有疾病，还要有完整的心理、生理状态和社会的适应能力。”从哲学上看，这表明
①每一次认识的实现都是有限的，但人类认识前进的趋势是无限的
②认识的发展总是一个由正确认识代替错误认识的过程
③社会实践随着人的认识的变化而变化  
④人的认识是一个反复曲折的过程

根据对话内容与上下文，在空白处填入适当的词，使对话完整，并将单词写在答题卡相应的位置上。每空一词。
(Tony is talking to his net friend Mark on QQ. )
Tony: Hello, Mark. ____ are you today?
Mark; Fine, thanks. I've just____  my homework.
Tony: How many classes did you have this morning?
Mark: ____ . Math, English, Music and P.E..
Tony: Do you like the P. E. class?
Mark: Of ____ . I like playing basketball very much. My favorite basketball _____  is Yao Ming.
Tony: Did you have any classes this afternoon?
Mark: Yes, we ____ two. After that I played basketball with my classmates.
Tony_: Really? I played basketball, ____ . By the way, we had a game with Class 2 this afternoon.
Mark: ____ you win the game?
Tony: No, we didn't. I hate to lose. I'm not____  at basketball, you know.
Mark: Don't be sad. You should always practice it.
Tony: You ____  right. Thank you.

不等式$\left|x+\frac{1}{x}\right|\ge \left|a-2\right|+\sin y$对一切非零实数x，y均成立，则实数a的范围为____

下列关于细胞癌变的叙述，正确的是（    ）

下列各项中，最能说明五四运动是中国新民主主义革命的开端的是(　　)