0  285116  285124  285130  285134  285140  285142  285146  285152  285154  285160  285166  285170  285172  285176  285182  285184  285190  285194  285196  285200  285202  285206  285208  285210  285211  285212  285214  285215  285216  285218  285220  285224  285226  285230  285232  285236  285242  285244  285250  285254  285256  285260  285266  285272  285274  285280  285284  285286  285292  285296  285302  285310  447090 

26. The Internet is a wonderful discovery, __________ of great significance to people’s lives.

  A. which I think           B. which I think it is    C. as I think      D. as is I think

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25.Keep on practicing.You will play the piano _______ , if not better than, Lan Lan.

    A.so good        B.so well         C.so well as       D.as well as

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24. I________ here earlier. I never thought the car would break down halfway.

A. could come         B. should come       C. would have come    D. may have come

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23. Some economists and historians think ________ is a close connection between war and economic depression.

A. there              B. it               C. what             D. that

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22.As a matter of fact, most shoplifters _______by constantly looking around for cameras.

A.give themselves away              B.show themselves away

C.put themselves away               D.bring themselves away

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第一节:语法和词汇知识(共15小题;每小题1分,满分15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. The shop assistant was dismissed as she was      of cheating customers.

A.accused        B.charged        C.scolded        D.cursed

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46.(9分)现提供如下实验材料与用具:适宜浓度的蔗糖酶、唾液淀粉酶、蔗糖、淀粉4种溶液,斐林试剂、恒温水浴锅。探究哺乳动物蔗糖酶和淀粉酶的催化作用是否具有专一性,请分析回答:

(1)实验设计:下表中“+”代表加入适量的溶液,“-”代表不加溶液。请分析:

溶液
试管
蔗糖溶液
淀粉溶液
蔗糖酶溶液
淀粉酶溶液

+
-
+
-

-
+
-
+

+
-
-
+

-
+
+
-

①验证蔗糖酶具有专一性,可选用的试管组合是_______________;

②验证淀粉酶具有专一性,可选用的试管组合是_______________;

③根据单一变量原则,无法形成对照的是______________________。

(2)实验步骤:

① 取四只洁净的试管,分别编号甲、乙、丙、丁;

② __________________________________________________________________;

③ __________________________________________________________________;

④ 观察实验现象并记录实验结果。

(3)结果预测:________________________________________________________

__________________。

(4)结论:____________________________________。

(5)在上述实验中,如果仅将37℃恒温水浴锅的温度调到10℃,而在其他条件不变的情况下重做上述实验,砖红色沉淀的颜色比37℃时浅,其原因是_______________________________________________________________________。

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45.(7分)下图是科学家对果蝇一条染色体上的基因测序结果,请据图回答问题:

   

   (1)图中朱红眼与深红眼两个基因是否为等位基因?______,是否遵循基因的分离定律

        和自由组合定律?________。该染色体上的基因中能否全部表达?_______,原因

        是_______________________________________________________。

   (2)若计算此染色体中基因的碱基数量,是否遵循A=T、G=C的原则?______,原因

        是________________________________________。

   (3)假定朱红眼基因中共有30个碱基对,则其控制合成的肽链中含有的氨基酸数为___。

       A.10个   B.20个  C.少于10个   D.多于20个

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