不属于宇宙空间的特点是（   ）

已知不等式|x+3|﹣2x﹣1＜0的解集为（x₀，+∞）

（Ⅰ）求x₀的值；

（Ⅱ）若函数f（x）=|x﹣m|+|x+ $\frac{1}{m}$ |﹣x₀（m＞0）有零点，求实数m的值．

“宅童”，泛指不喜欢外出与朋友游玩，一个人待在家里看书、做作业、看电视、上网、玩游戏的孩子。有些网友称“00后”为“iPad一代”，网络游戏让许多孩子成为“宅童”。你想对“宅童”说 （    ）
①沉迷网络是应抵制的不良诱惑                 ②“宅”在家里不利于身心健康
③封闭自己不利于良好人际关系的建立     ④网络对未成年人弊大于利

通读下面的短文，掌握其大意，然后从各题所给的A、B、C三个选项中选出一个最佳答案。

Dear Sally,

    How are you? I'm happy that you can do the things you 1 at home. I never have fun, because there are too many  2 in my family. My parents are strict. I have to  3  at six o'clock every morning. And I have to make my bedroom4  before breakfast and then go to school. I can't play with my friends after school. I have to do5 homework. After dinner I have to take the dog for    6 walk in the park. I can't watch TV on school nights. I have to 7 the violin for an hour. I can't go to bed late. I have to be in bed 8 nine o'clock. On weekends I have to clean my room and 9 the dishes. I also have to go to learn the violin on Sundays. I'm 10 tired. Can you help me?

                                                                                                                                                                            Yours,

                                                                                                                                                                             Lisa