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
第一節(jié) 語法和詞匯知識(shí)(共20小題;每小題1.5分,滿分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
題 |
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 |
題 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
|
|
|
|
|
答 |
C |
C |
B |
C |
B |
B |
C |
D |
B |
C |
|
|
|
|
|
1.實(shí)驗(yàn)研究PH對(duì)酶活性的影響。準(zhǔn)備五只含有等量的酶溶液但PH各不同的試管,每只試管加一塊1cm的正方形凝固蛋白塊,試管均處于250C室溫下,將各試管蛋白消失的時(shí)間記錄下表:
酶溶液的PH值 |
蛋白塊消失的時(shí)間(min) |
1 |
13 |
2 |
9 |
3 |
11 |
4 |
45 |
5 |
大于60 |
(1)酶活性最強(qiáng)時(shí)pH是 ,判斷依據(jù)是 ,該酶在人體內(nèi)
稱之為 。
(2)請(qǐng)以兩種方式改進(jìn)實(shí)驗(yàn),使實(shí)驗(yàn)在更短的時(shí)間內(nèi)完成。
方式一 。
方式二 。
高一年級(jí)生物試題
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