问题 填空题

  • A.条件(1)充分,但条件(2)不充分.
  • B.条件(2)充分,但条件(1)不充分.
  • C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
  • D.条件(1)充分,条件(2)也充分.
  • E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.)


(1)数列{an}的通项公式为an=2n
(2)在数列{an

答案

参考答案:B.

解析: 若(1)成立,则[*]故(1)不充分.
若(2)成立,由[*]可知{an)是首项为1、公比为2的等比数列,故[*]是首项为1、公比为4的等比数列,从而它的前n项和为[*]故(2)充分.

解答题
完形填空

II. 完形填空(共15题,每小题2分,共30分)

My best friend is Cocoa, and I live in a senior-citizen apartment. Cocoa is a ten-year-old dog and I am a sixty-nine-year-old lady, so you can see we both qualify as   11  citizens.

He is a   12  companion. He does many amusing things that make me  13  , and when that happens, he is so delighted  14  he just keeps it up.

But one afternoon, Cocoa started acting strangely. I was sitting on the floor playing with him,  15  he started pawing and smelling at the right side of my  16  . He had never done anything like this ever before, and I told him, “No.” To Cocoa, one “no” is usually  17 , but not that day. He stopped briefly, and then  18   ran toward me, throwing his entire weight at the right side of my chest. He crashed into me and I cried in   19  , falling down to the floor. Soon after this, I felt a lump (肿块). I went to my doctors, and after X-rays  20   and lab work were done, they told me I had cancer.

When cancer starts, a  21   of calcium (钙) builds. Then the lump or cancer attaches itself to this wall. When Cocoa jumped on me, the force of the impact broke the lump away from the wall. This made it possible for me to  22   the lump.

I had a complete mastectomy ( * * 切除术) and the cancer has not   23  to any other part of my body. The doctors told me if the cancer had gone undetected even six more months, it would have been too  24  .

Was Cocoa  25   of just what he was doing? I’ll never really know. What I do know is that Cocoa not only shares his life with me, he has also made sure that I will be around to share my life with him!

11    A.    good       B.    standard  C.    senior      D.    great

12    A.    wonderful       B.    tiring      C.    hungry    D.    bad

13    A.    leave       B.    cry   C.    laugh      D.    jump

14    A.    as    B.    when      C.    and  D.    that

15    A.    when       B.    then C.    though    D.    as

16    A.    chest       B.    body       C.    shoulder  D.    arm

17    A.    right       B.    good       C.    enough    D.    unexpected

18    A.    hurriedly B.    rudely     C.    slowly     D.    suddenly

19    A.    pain B.    surprise   C.    trouble    D.    danger

20    A.    experiments    B.    researches       C.    tests       D.    papers

21    A.    wall B.    cancer     C.    body       D.    number

22    A.    watch      B.    have C.    get   D.    notice

23    A.    ran   B.    kept C.    entered    D.    spread

24    A.    common  B.    late  C.    much      D.    early

25    A.    ashamed  B.    aware      C.    afraid      D.    tired