It is Saturday morning. Mr. and Mrs. Green are at home 1 their two children.2 is their son, Jim. 3 is their daughter, Kate. They 4 have classes today. They are 5 chess in their room. They are 6 happy. Mr. Green is 7 a book in the living room.  8 is Mrs. Green? 9 is in the kitchen(厨房).She is cooking(烹调） lunch 10 the family.

    What a happy family!

1912年6月出版的小学教材《共和国教科书新国文》介绍了两个月前泰坦尼克号邮轮遇险事件如图。这反映出

① 教材编撰者关注国际时事
② 教材编撰者倡导人性向善
③ 民国初期公民教育成效显著
④ 民国初期妇女地位显著提高

增进青少年心理健康，保持愉快心情的方法主要有____、宣泄烦恼和自我安慰等．

下列物质的用途与其依据的性质关系不相符的是（　　）

如图，已知函数y=﹣2x+4，观察图象回答下列问题

（1）x____ 时，y＞0；（2）x____ 时，y＜0；

（3）x____ 时，y=0；（4）x____ 时，y＞4．