25. The number of kidnappings in Britain _____ dramatically over the past five years.
A. had increased B. increased C. is increasing D. has increased
24. “It’s with a great amount of shame ______ I stand before you and tell you that I have betrayed your trust.” Jones confessed.
A. How B. that C. when D. until
23. ______ some people believe teenagers don’t have much to do with politics, it doesn’t mean they are not involved in the world around them.
A. While B. Since C. Before D. Unless
22. In recent years, _____ many riders-including last year’s winner, Floyd Landis, and several riders this year-have been accused of taking drugs to help them that the most difficult race no longer seems special.
A. such B. as C. so D. too
To be 20 in driving.
PART TWO LANGUAGE KNOWLEDGE
SECTION A
Directions: Beneath each of the following sentences there are four choices marked A, B, C, and D. Choose the one answer that best completes the sentence.
21. Major clubs depending on their experienced leaders can be traced to the Indian culture ______ family members respect their elders.
A. which B. whose C. where D. that
19 .
Neither the two drivers had been drinking or the 18 were poor.
●The time to take place
At 16 , this afternoon
●The students
Some got off the bus, some were hurt 17 .
46.(12分)(09全国高考II)请用所给的实验材料和用具,设计实验来验证哺乳动物的蔗糖酶和淀粉酶的催化作用具有专一性。要求完成实验设计、补充实验步骤、预测实验结果、得出结论,并回答问题。
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、试管、37℃恒温水浴锅、沸水浴锅。
(1)若“+”代表加入适量的溶液,“-”代表不加溶液,甲、乙等代表试管标号,请用这些符号完成下表实验设计。请在答题卡上做答。
试管\溶液 |
蔗糖溶液 |
淀粉溶液 |
蔗糖酶溶液 |
唾液淀粉酶溶液 |
甲 |
+ |
- |
+ |
- |
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(2)实验步骤:
①按照上表中的设计,取试管、加溶液。
(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20℃,而在其他条件不变的情况下重做上述实验,出现砖红色试管中的颜色会比37℃时的浅,其原因是_______________________________________________________________________。
45.(8分)(09山东理综34)人参是一种名贵中药材,其有效成分主要是人参皂苷。利用细胞培养技术生产人参皂苷的大致流程如下:
请回答:
(1)配制诱导愈伤组织的固体培养基,分装后要进行 。
接种前,要对人参根进行 。
(2)用于离体培养的根切块,叫做 。培养几天后发现少数培养基被污染,若是有颜色的绒毛状菌落,属于 污染;若是有光泽的黏液状菌落,属于
污染。
(3)用少量 酶处理愈伤组织,获取单细胞或小细胞团,在液体培养基中进行悬浮培养,可有效提高人参皂苷合成量。
(4)人参皂苷易溶于水溶性(亲水性)有机溶剂,从培养物干粉中提取人参皂苷宜选用 方法,操作时应采用 加热。
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