27.--- Now the situation has been kept under ______ control.
--- Yes.______ role John played in it was very important.
A.the; A B./; The C.the; The D./; A
26._______ reaching the top of the mountain, a feeling of happiness and a sense of achievement will be experienced.
A.With B.In C.About D.Upon
25.The computer was used in teaching.As a result, not only _______, but students became more interested in the lessons.
A.saved was teachers’ energy B.was teachers’ energy saved
C.teachers’ energy was saved D.was saved teachers’ energy
24.They are sure that they can make ______ possible for their model cars to run without electricity.
A.so B.much C.that D.it
23.Germany nipped Ghana 1-0 in their last World Cup Group D game, _______ sent both teams into the last 16 at 2010 World Cup.
A.which B.where C.what D.that
22.The Internet gives people the chance to have the information _______ quickly and cheaply.
A.to deliver B.deliver C.delivered D.delivering
第一节:单项填空(共15小题;每小题1分,满分15分)
21.I have told you the truth._______I keep repeating it?
A.Must B.Can C.May D.Will
第三节(共5小题,每小题1.5分,满分7.5分)
听下面一段材料, 将16至20三个小题的信息补充完整,每小题不超过3个单词。
|
Our Library ● Kind of the library: an English language 16._____________ library ● People who can definitely join: teachers of English, university students and professionals who are in the 17.__________, engineering and managing fields ● People who have to apply: those from 18._____________ ● Rules for borrowers: a.borrow one video at a time and return it 19._____________ b.borrow 20.____________ at one time and return them within one month |
第一节(共15小题,每小题1.5分,满分22.5分)
听下面一段对话,回答第1至第2两个小题。
1.What language does the man speak?
A.English, French and Chinese.
B.English, Chinese and Korean.
C.English, German and French.
2.How does the man practice his German?
A.With a teacher. B.With a neighbor. C.At a language school.
听下面一段对话,回答第3至第4两个小题。
3.Who loves watching the football program?
A.The husband. B.The wife. C.The children.
4.When do the children watch TV?
A.On the morning of Saturday.
B.On the evening of Saturday.
C.In the evening every day.
听下面一段对话,回答第5至第6两个小题。
5.Why is the man late?
A.He ran into his sister.
B.His car broke down.
C.The traffic was heavy.
6.Who asked the man to call back?
A.Tommy. B.Bob. C.His sister
听下面一段对话,回答第7至第8三个小题。
7.What’s the probable relationship between the two speakers?
A.Boss and secretary. B.Police and witness. C.Teacher and student.
8.What was the woman doing when the accident happened?
A.Standing outside the bank.
B.Crossing the street.
C.Coming up York road.
9.What’s the speed of the car when the accident happened?
A.10 miles per hour.
B.20 miles per hour.
C.30 miles per hour.
听下面一段对话,回答第10至第12三个小题。
10.Which film are the speakers going to see?
A.Action Man 4. B.Mad Doctor Brown C.Rex
11.What are they going to do first?
A.Eating something. B.Seeing the film. C.Meeting at the cinema.
12.When will the film begin?
A.At 6 o’clock. B.At 18 o’clock. C.At 8 o’clock.
听下面一段对话,回答第13至第15三个小题。
13.What’s the topic of the conversation?
A.About smoking. B.About rights. C.About health.
14.What’s the woman’s attitude toward smoking?
A.Favorable. B.Disapproval. C.Neutral.
15.What’s the man’s opinion about smoking in public places?
A.Smoking is bad for health.
B.No one has the right to smoke.
C.He has the right to smoke whenever he wants.
18.(6分)多数真核生物基因中编码蛋白质的序列被一些不编码蛋白质的序列隔开,每一个不编码蛋白质的序列称为一个内含子。这类基因经转录、加工形成的mRNA中只含有编码蛋白质的序列。某同学为检测某基因中是否存在内含子,进行了下面的实验:
![]()
步骤①:获取该基因的双链DNA片段及其mRNA;
步骤②:加热DNA双链使之成为单链,并与步骤①所获得的mRNA按照碱基配对原则形成双链分子;
步骤③:制片、染色、电镜观察,可观察到图中结果。
请回答:
(1)图中凸环形成的原因是: 。
(2)如果现将步骤①所获得的mRNA逆转录得到DNA单链,然后该DNA单链与步骤②中的单链DNA之一按照碱基配对原则形成双链分子,理论上也能观察到凸环,其原因是逆转录得到的DNA单链中不含有 序列。
(3)DNA与mRNA形成的双链分子中碱基配对类型有 种。
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