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2、某三十九肽中共有丙氨酸4個，現(xiàn)去掉其中的丙氨酸得到4條長短不等的多肽（如右圖），下列有關(guān)該過程的敘述中，錯誤的是

A．O原子數(shù)目不變 

B．肽鍵數(shù)目減少7個  

C．C原子減少l2個 

D．氨基和羧基分別增加3個

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科目： 來源：gzsw 題型：

1、下列物質(zhì)或結(jié)構(gòu)中含有糖類的是

①ATP  �、贒NA　  ③染色體　  ④細胞膜　  ⑤脂肪  �、薜矸勖�

A．①②③④        B．①③④⑥      C．①②③⑥       D．②③④⑥

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科目： 來源：gzsw 題型：

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科目： 來源：gzsw 題型：

38、（You may read the questions first）

Products: mail order

Bay 3-piece luggage set for only  ￡69.99                   ALL ORDERS           

Half price offer                                         DELIVERED                     

Pack with confidence, Travel in Style…. Arrive intact           DELOVERED              

This elegant luggage is manufactured in a new hard-wearing plastic FREE TO YOUR

 which is strong and very light in weight                        DOOR

·Light but hard-wearing

·3 locks （2 key and I combination lock ）for total security

·Supplied with initials for personalization

MD 9572 ￡69.99

Plan your journey they easy way This portable Traveler will give you directions from A to B

anywhere in England, Scotland and Wales. Just enter the start and the end of your journey and the Traveler will work out the quickest route. The Traveler can also estimate the journey time. average speed and fuel consumption. Need to change your journey at any stage?The Traveler will give you a new set of directions. Other features include auto shut-off.And a built-in light for night-time use.

Powered by 4AA batteries （not supplied）.

MD 7437 Traveler ￡69.99

How much do you know?

Everyone, young and old, enjoys and challenge of quizzers. Our electronic Quizmastercontains 5,400 questions and answers in 6 classifications-general knowledge, sport, science, geography, art and history. Each of these is further divided into 3 skill levels（easy, medium and difficult）so younger children can fairly compete against teenagers and adults. PLUS!

Every Quizmaster includes:

·8 Games of Hangman

·Portune Teller Games

·10-digit calculator

·long life cell batteries included

MD 9569 Quizmaster was ￡19.99 now ￡14.99

1 In advertisement 2, the Traveler enables us to learn__________.

A. the road conditions from London to Oxfords

B. all the garages along the chosen route

C. the time and speed of the journey in Britain

D. the directions from London to Paris.

2 In advertisement 3, the Quizmaster_________.

A. contains nothing but 5400 questions  B. can only answer challenging questions

C. can be purchased in many shops     D. can be used by people of all

3 All these advertisements are aimed at those_________.

A. who like to order goods at home    B. who are going to travel abroad

C. who do market researches         D. who are interested in intelligence tests

 

 

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科目： 來源：gzsw 題型：

36、Our English teacher had us all _______our names on a card.

A. written     B. to write        C. write            D. for writing

 

 

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科目： 來源：gzsw 題型：

35、They ______ be at home. You see, the door is locked from the outside.

A. can’t       B. may          C.  must           D.  mustn’t

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科目： 來源：gzsw 題型：

34、The farmer who admitted ______ the tiger was severely punished.

A. to kill      B. killing        C. killed            D. to have killed

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科目： 來源：gzsw 題型：

33、So often ______ in recent years that it has almost become a rule.

A. has this happened              B. this has happened

C. is this happening               D. for this to happen

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科目： 來源：gzsw 題型：

32、市場上銷售的大�；ㄉ托×；ㄉ峭环N植物兩個不同的品種。為探究大、小�；ㄉN子的大小是否是遺傳物質(zhì)不同造成的，某興趣小組對大、小�；ㄉN子進行了如下實驗：

（1）將一小塊實驗地均分成兩份，隨機抽取種子公司購買的純合大、小�；ㄉN子各20粒分別種在上述兩塊實驗地中。

（2）收獲期分別收集兩塊地中的大、小�；ㄉ麑�。曬干處理后，隨機抽取大、小�；ㄉN子各30粒,對它們的長度進行測量, 并將數(shù)據(jù)記錄在各自的表格中。

（3）將表格中的數(shù)據(jù)轉(zhuǎn)換成單坐標雙曲線圖，如下圖所示。

（4）求出大、小�；ㄉN子的平均長度分別為1.77cm和1.18cm。

根據(jù)材料回答下列問題：

（1）該興趣小組的實驗步驟中有兩處明顯的失誤是：

①                                    ；②                                   。

（2）假設(shè)圖中的數(shù)據(jù)是經(jīng)正確實驗步驟操作后獲得的，則大�；ㄉN子平均粒長比小�；ㄉN子的平均長度要長，說明                                                      ；

大粒花生種子中有比小�；ㄉN子長度短的，小�；ㄉN子中也有比大�；ㄉN子長度長的，說明                                                                      。

（3）大、小�；ㄉN子的大小取決于種子子葉的大小。觀察發(fā)現(xiàn)大�；ㄉN皮顏色為淺紅色，小�；ㄉN皮顏色為深紅色。為了進一步了解花生種子大小和種皮顏色的顯隱性關(guān)系，請你簡要寫出實驗設(shè)計思路，并就可能出現(xiàn)的實驗結(jié)果和結(jié)論進行討論。

 

 

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