若单调递增数列{a_n}满足a_n+a_n+1+a_n+2=3n﹣6，且a₂=$\frac{1}{2}$a₁，则a₁的取值范围是____ 

问：

（一）话题作文

在成长过程中，我们需要一路摒弃许多东西，比如嫉妒、自私、冷漠、怯懦、利欲……但也有许多东西千万不能缺失，正直、勇敢、诚信、善良、宽容，这些都是生命行囊中闪光的珍珠，谁把它们弄丢，谁的生命就会失去一份色彩。

请以“舍得”为话题写一篇作文。

（二）命题作文

请以“那一件旧物”为题写一篇文章。

要求：（1）以上两题，任选其一作文。（2）除诗歌、戏剧外，文体不限。（3）不少于600字，书写规范工整。（4）文中不涉及真实的人名、地名、校名。

    A boy and his father were walking in the mountains. Suddenly the boy fell，hurt himself，and cried，"AAAhhhhhhhh！！！"To his surprise，he heard the voice repeating（重复），somewhere in the mountain,“AAAhhhhhhhh!!!＂Then the boy shouted，“Who are you?” He received the answer，"Who are you?" He got angry at the answer，so he shouted，"Foolish!" He received the answer，"Foolish！”
He looked at his father and asked，“What’s going on?" The father smiled and said，"My son，listen.”And then he shouted to the mountain，"I love you！”The voice answered，“I love you!”Again the man cried，"You are the best！"The voice answered，“You are the best！”
    The boy was surprised, but did not understand. Then the father explained（解释），"People call this‘Echo’，but really this is Life. It gives you back everything you say or do. Our life is just a reflection（反映）of what we have done. If you want more love in the world，have more love in your heart. If you want to be successful，work hard. This can be used in everything in life. Life will give you back everything you have given to it.”