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
7. The boy is lying in bed ______ his left side, listening to the music.
A. in B. to C. on D .at
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
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
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
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
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
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。
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(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 。
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。
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。
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(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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