下列七种晶体：A．二氧化硅、B．乙烷、C．碳酸钠、D．晶体硅、E．氩气、F．过氧化氢、G．镁、H．氢气（用字母填空）

（1）属于原子晶体的是　 ____　，不存在任何化学键的是　 ____　；

（2）只含有非极性键的物质是　 ____　，既有极性键又有非极性键的物质是　 ____　，含有离子键、共价键的化合物是　 ____　；

（3）在一定条件下能导电且导电时未发生化学反应的单质是 ____

2014年第十期、第十一期和第十二期电子式储蓄国债受到投资者追捧，三年期和五年期的产品特别抢手，首日便售罄。国债热销的原因可能是（   ）

①股市不给力，楼市投资受限

②国债在各种投资方式中风险最小且收益最高

③国债是由银行等金融机构发行的，风险小

④国债以税收作为还本付息的保证，安全系数高

读“地球上昼夜分布示意图”（阴影部分表示黑夜），回答：A地的季节和此时的昼夜长短状况是（   ）

This story is about Mrs. Jones, an 82-year-old lady.   1  her life was hard, she was always nicely dressed every day.

  This morning Mrs. Jones was moving to the nursing home（养老院）. The nursing home was very 2  . After hours of waiting, Mrs. Jones still smiled sweetly when she was told that her room was ready.   3 the way to her room. I told her what the room was like.

  Suddenly she said, “I love  4 !”

  “ 5  Mrs. Jones, you haven’t seen the room yet!” I was surprised at her reply.

  She stopped and said, “Whether I like my room or not doesn’t depend on how the furniture is6  . It depends on how I decide to  7  the room. I have already decided to love the room before I  8  see it .”

  Then she continued, “I have a 9 . I can spend the day in bed and consider how tiny my room is. Or I can just get out of bed and be thankful that I can  10  enjoy a new day. Each day is a   11 , I'll enjoy my life and all the happy memories that I have stored in my bank account(帐户) before.”

  Life is like a bank account. You can take out what you've put in. If you have put a lot of   12   in your bank account, you can take out some of it when you feel sad.

  Attitude（态度）is everything.