命题p：∀x∈R，x²+ax+a²≥0；命题q：∃x∈R，sinx+cosx=2，则下列命题中为真命题的是（　　）

    Welcome to ____ (I) room. Look at the photo ____ the wall. You can ____ (see) my parents, my sister and me in the photo. Look! This is my jacket. It is ____ . My hat is blue, too. They ____ (be) on my bed. Oh, can you see the model plane?____ looks very nice . You can see my books ____ pencils are on the desk. ____ is my baseball? It's ____ on the desk. It's under the chair. Do you want to make friends(交朋友) with me? You can call me ____ 689-5265.

多细胞动物和植物相比较，动物特有的结构层次是（  ）

2015年全国道德模范吴恒忠，为兑现承诺，上山开荒，日夜辛劳，节衣缩食，替儿子还债15万元。这表明吴恒忠老人（    ）

①有健康的人格                                                          ②为了诚信牺牲个人利益不值得

③对自己的承诺负责，是一个诚实守信的人          ④是一个值得信任的人