Unit 1 Friendship Learning about language课时作业
第一节：单项选择
1. It is commonly believed that______eats plenty of fresh vegetables and works regularly is less______to suffer anxiety or depression.
A.whoever; possible B.who; likely C.who; possible
D.whoever; likely
2.________is certain, though,is that “the curse of the mummy”remain a riddle to this day.
A.It B.What C.As D.That
3.Our factory has introduced advanced technology early this year,and thus we can produce______last year.
A.twice as more bicycles as B.more bicycles than twice
C.more than twice bicycles as D.more than twice as many bicycles as 4.The new system has been designed to give students in our school quick and easy _______to the digital resources of the library.
A.access B.passage C.way D.forecast 5.----Madam,your suitcase seem too heavy for you .Do you need my help? ----________.I can manage it.
A.It’s all right B.My pleasure C.No doubt. D.With pleasure 6.----I hear John refused to say sorry to his wife and broke up with her week. -----Where did you________?
A.pick that up B.put that up C.make that up D.take that up 7.When Alice got hone after a whole day’s work,she felt in her bag for the key,only to find it was nowhere__________.
A.to see B.to be seen C.seen D.to be seeing
8.UN stands for the United Nations,which is an international organization that aims to help economic and social conditions improve and to solve political in the world in a _______way.
A.hopeful B.powerful C.peaceful D.grateful
9.When sunlight travels through the air,the CO molecules(分子)__________different colors from the light,which is analyzed by the satellite to find out how much CO2there in the air.
A.boring in B.put in C.take in D.break in 30.As is reported in China Daily,Mar.13,Li Xiaobing,an official in ShanxiProvince,failing to explain pollution problems on live TV leads__________jobs.
A.him to losing B.his to losing C.to him lose D.to his losing 31.---Have you brought the photo of your family .Helen? ----Yes.I___________for it the whole morning.
A.looked
B.have looked
C.have been looking D.had looked
32.Nine in the parents said there were differences in their approach __________their children compared with ___________of their parents.
A.to educate; both C.to educating; that
B.to educate; one D.to educating; those
33.----Would you please tell me something more about the Group of Eight?
-----Well ,the G8 is an international organization_________richest countries in the world.
A.making up of B.consisted of C.consisting of D.made of
34.Nobody believed his reason for being absent from the important meeting _________he had to meet his uncle the airport.
A.why B.because C.where D.that 35.The book is said________into many languages and enjoys great popularity.
A.to translate
B.to have been translated D.translating
C.having been translated
【答案】DBDAA DBCCA ACCDB 第二节 阅读理解
It’s hair-raising news for criminals on the run. Scientists behind a new study have worked out how to identify individuals only based on the proteins(蛋白质) in a single strand of their hair.
While the police already look at DNA from hair as part of investigations, the technique is far from ideal: DNA is easily degradable, meaning it can only be analysed within a certain time period after the crime. But the new technique could even be used to solve historical or archaeological cases, making it far superior to DNA sequencing in many ways.
DNA degradation depends on several environmental factors includingtemperat
ure, humidity and PH. It is also affected by the activity of bacteria and other microorganisms.In contrast,actual hairs can survive for a long time—sometimes centuries.After bones and teeth,hair is in fact one of the most resistant structures of the human body.
In order to understand how the protein can be used to identify individuals,it is important to understand that proteins are coded by DNA.This means that a certain level of the genetic variation that we see in different people’s DNA passes into their proteins.In fact,genetic information in the DNA is translated into amino-acid chains that make up proteins.
The method not only allows for human identification but it can also reveal how old the sample is and what region it comes from,so that we can distinguish between current and ancient samples.But while the discovery is exciting,the technique is not quite polished enough to be used in the court room.The main task now will be to analyse hair samples from all over the world,which will make it a lot more reliable.
The new discovery will boost the significance of hair as evidence in courts,at a time when some forensic(司法鉴定的) disciplines have been criticised in the US.It will also be of great use in archaeology.
1.What’s the main idea of the passage? A.DNA evidence is far from ideal. B.Criminals on the run get hair-raising news. C.Scientists are planning a test of human hair. D.Humans can be identified by proteins in hair.
2.Which evidence is more reliable for the police to identify a criminal? A.Lost teeth.
B.The footprint.
D.Damaged DNA.
C.Personal belongings.
3.In what way is the new technique superior to DNA test?
A.Serving as evidence in courts. B.Possessing genetic information. C.Inferring the height of a person. D.Distinguishing the region of a person. 4.Who will welcome the discovery? A.Criminals.
B.Employers. C.Hairdressers.
D.Archaeologists.
语篇解读:本文是一篇说明文。尽管大多数犯罪现场都含有人的毛发,但是细胞核DNA往往缺失,阻碍了案件的侦破。为此,法医界也在积极开发DNA分析以外的身份识别技术。美国
2019--2020学年人教版必修一Unit 1 Friendship learning about language课时作业 (1)
