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27.We’d be very grateful if you could join us because your cooperation will    the timely completion of our project.

     A.reach for          B.make for          C.go for             D.stand for

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26.As angry crowds got into the streets fighting for their basic rights, the local government    

the police to keep order.

     A.called in          B.brought about     C.picked out        D.paid back

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25.When you     , use a handkerchief to cover your nose and mouth. This is particularly necessary in public places.

     A.speak             B.whisper           C.sneeze           D.breathe

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24.Pictures on TV show the quake-hit capital    to ruins and helpless survivors waiting eagerly for relief.

     A.decreased        B.destroyed         C.returned          D.reduced

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23.Having worked as a doctor for so many years, Mr. White has     rich experience in battling with various diseases.

     A.accumulated      B.reserved          C.increased         D.developed

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22.A trip to the forest park is a wonderful    of my happy childhood, when I had no end of fun with my playmates.

     A.adventure        B.celebration       C.reminder         D.attraction

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第一节:单项填空(共10小题,每小题1分,满分10分)

从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

21.I must have been a great    to my parents in those hard days, for I never failed to live up to their expectations.

     A.achievement      B.comfort           C.disappointment   D.support

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34.(8分)  

     在全球变暖的大背景下,低碳经济受到越来越多国家的关注。下图示生态系统碳循环的部分过程,其中甲、乙、丙表示生态系统中的三种成分。试分析

   (1)《联合国气候变化框架公约》将“从大气中清除二氧化碳的过程、活动和机制”称之为“碳汇”,图能表示“碳汇”的过程是      (用图中数字序号表示),这一过程主要发生在甲图中       处(在a~d中选择)。

  (2)X与甲图细胞所示生物类群的能量来源不同,X代表的生物能量来源为        ,X的细胞结构的主要特点是       

  (3)生态系统中,乙的成分为        。能降低温室效应的成分是     ,理由是           

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