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
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
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
23. Some economists and historians think ________ is a close connection between war and economic depression.
A. there B. it C. what D. that
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
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
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:
![]() 试管 |
蔗糖溶液 |
淀粉溶液 |
蔗糖酶溶液 |
淀粉酶溶液 |
甲 |
+ |
- |
+ |
- |
乙 |
- |
+ |
- |
+ |
丙 |
+ |
- |
- |
+ |
丁 |
- |
+ |
+ |
- |
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_______________________________________________________________________。
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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