8.This kind of material ___ , so be careful when you wear it.
A. is torn easily B. is torn easy C. tears easily D. tears easy
7. ___ to reach them on the phone, we sent an email instead.
A. Fail B. Having failed C. To fail D. Failed
6.During the three years of school life, our class ___ to be a good team group.
A. was proved B. is proving C. has been proved D. proved
5.The students are used to taking part in the ___ run every morning in our school.
A. 800 metres length B.800-metres-long
C.800 metre length D. 800-metre-long
4. is important in people’s daily life.
A. Water B. The water
C. Waters D. A kind of water
3.You ___ have told him the bad news, which made things even worse.
A. needn’t B. oughtn’t to C. couldn’t D. wouldn’t
2.-Shall I give you a ride as you live so far away?
-Thank you. .
A. If you like B. Of course you can
C. It couldn’t be better D. It’s up to you
第一节 语法和词汇知识(共20小题;每小题1.5分,满分30分)
1.Hangzhou is ___ most beautiful city, where you can see ___ famous West Lake.
A. a; the B. a; / C. the; a D. /; the
题 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
答 |
C |
C |
B |
A |
B |
C |
B |
C |
B |
B |
C |
C |
C |
C |
B |
题 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
|
|
|
|
|
答 |
C |
C |
B |
C |
B |
B |
C |
D |
B |
C |
|
|
|
|
|
1.实验研究PH对酶活性的影响。准备五只含有等量的酶溶液但PH各不同的试管,每只试管加一块1cm的正方形凝固蛋白块,试管均处于250C室温下,将各试管蛋白消失的时间记录下表:
酶溶液的PH值 |
蛋白块消失的时间(min) |
1 |
13 |
2 |
9 |
3 |
11 |
4 |
45 |
5 |
大于60 |
(1)酶活性最强时pH是 ,判断依据是 ,该酶在人体内
称之为 。
(2)请以两种方式改进实验,使实验在更短的时间内完成。
方式一 。
方式二 。
高一年级生物试题
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