书面表达。

     假如你就读于一所国际学校，前不久，你们班组织了一次“My learning Experience”的主题班会，

其中的三位同学介绍如下：

Betty: I'm happy that I'm making progress. I have done much better than before.

Charlie: My result is not bad, but I still have room to improve, for example, math. I did well in

              Chinese and physics.

Anne: I spent a lot of time on science but I didn't do as well as I wanted to. It's hard to believe.

现在，请你根据三位同学的介绍完成以下总结性发言。

Boys and girls,

     I'm very happy that many of you have shared your learning experiences with the class. Betty is

(1) _________. Charlie still has room to (2)_________ his math. But Anne didn't (3)_________ in her

science. In my opinion, successful or not, it is not the most important in our lives. What we need to do

is to (4) _________.

                                                                                                                               Thank you.

右图是一袋化肥标签的一部分，请回答：

（1）CO（NH₂）₂的相对分子质量为：______；

（2）CO（NH₂）₂中各元素的质量比为C：O：N：H=______；

（3）CO（NH₂）₂中N元素的质量分数为：______（保留一位小数）；

（4）一位农民计划施加2kg该化肥，则给农作物施加的N元素质量为：______kg．

（5）该袋化肥中尿素的质量分数为：______（保留一位小数）．