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8. One reason that we haven’t had his letter is that he ___it to our old address by mistake.

 A. might send               B. may have sent         

C. should send              D. should have sent

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7. The boy is lying in bed ______ his left side, listening to the music.

A. in             B. to          C. on         D .at   

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5. Can you ______me a few minutes on the planning of the English speech contest?

  A. share       B. spend       C. save       D. spare 

6 I appreciate _____ in the contest when one competitor gets the first prize. 

A. this    B. that      C. it      D. one  

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4. Though the radio seems a bit too expensive, it is well_________.

  A. worth to buy           B. worth  buy           

C. worthy of buying            D. worthy to be bought

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3. As a result of destroying the forests, a large ____of desert ____ covered the land.        

A. number; has           B. quantity; has 

C. number; have        D. quantity; have 

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2. _____ in the newspaper,there is another good harvest this year.  

  A. It has reported         B. As is reported   

C. That is reported          D. It is reported  

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1.While I was working with the company, I _______an interpreter.

A. pretend to be        B. served as 

C. played the part in      D. turned to  

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3、(16分)下图是胰腺组织局部结构模式图,请据图回答。

(1)A液为      ,B为      

C液为         ,三者共同构成了胰腺组织细胞生活的内环境。

(2)CO2不能从毛细血管进入胰腺组织细胞的原因是                。胰腺组织细胞通过有氧呼吸产生的二氧化碳进入血浆需要穿过     层膜

(3)人体内的胰腺组织细胞可分泌胰消化酶和胰岛素,其中         可进入血液,参与人体内物质代谢的调节,如果该物质分泌不足,可使血液中         浓度升高,导致糖尿病的发生。

(4)胰腺组织细胞内环境的稳态是在             作用下,通过机体的各种器官、系统分工合作、协调统一而实现的。

食物
 
4、(14分)下图为血糖的来源和去路示意图,请填写下列内容:

(1)⑤过程进行的场所是           

⑥代表的物质是        ,⑦代表的物质是       

(2)当血糖含量高于    mg/dL时,医学上称为高血糖,正常身体的血糖为     mg/dL

(3)能够促进②过程进行的激素是    ,能够抑制②过程的激素是     

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2、(10分)右图为我国北方处于稳定状态的某森林生态系统碳循环示意图,图中A、B、C、D分别代表生态系统的成分,①-⑦代表碳元素的传递过程。请据图回答:

(1)物质循环过程中,联系生物群落与无

机环境的两大“桥梁”是[  ]_____________

和[  ]____________。

(2)碳元素在无机环境和生物群落之间的

循环形式是_________________,而生物群落中

的碳则以_________________的形式在其内部沿

_________________传递。

(3)碳元素是通过[  ]__________过程由无机环境进入生物群落的,而由生物群落归还到无机环境中则主要依靠各类生物的___________。与碳元素在生态系统中的变化相比,能量流动的特点是_______________和______________。

(4)与草原生态系统相比,该生态系统营养结构的特点,决定了其_____________稳定性较强。

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1、(10分)下图是食物关系图。分析并简要回答:

(1)该图是一个简单的___________,含有___________条食物链。

(2)图中的初级消费者是___________,蛇是___________消费者,属___________营养级。鹰同时占有___________个营养级。

毛虫
 
(3)图中的兔和蚱蜢两者是___________关系,而蜥蜴和蚱蜢是___________关系。

(4)蛇每增加1千克体重至少需_______千克蜥蜴,所消耗的绿色植物至少______千克。

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