若数列{a_n}满足$a_1=2,a_{n+1}=1-\frac{1}{a_n}$，则a₂₀₀₇的值 （   ）

阅读短文，根据短文内容判断正误，在括号内写正确或错误。

    I'm Chinese girl. My English name is Lily. I like English very much. I can speak(说) some English now. I have a good friend. Her name is Ann. She has long hair and blue eyes. She's from America. This is my classroom. It's not big, but it's nice and clean. There are twenty-four desks and chairs in it. They are new. I like my classroom very much.

青藏高原纬度较低,但是气候寒冷,影响气候的因素是

化学知识在生产和生活中有着重要的应用．下列说法中，错误的是（　　）

（1）写出绝对值大于3且小于7的所有整数．

（2）用科学记数法表示海王星与地球的距离约为4350000000千米．