题目内容

3．Sometimes ____ you know you've done something wrong and you feel bad about it，it takes courage to say sorry．（　　）
A．onceB．only ifC．unlessD．even though

分析 有时尽管你知道做错了事感觉很糟糕，但要说出对不起还是需要勇气．

解答 答案：D
题干中you know you've done something wrong and you feel bad about it与it takes courage to say sorry存在转折关系；once一旦，only if要是怎样该多好，unless除非，even though尽管；句意表达的是让步关系，表示即使，尽管的意思，引导一个让步状语从句．故选D．

点评 从属连词是连词的一种，用来引导名词性从句和状语从句．大致可分为三大类：that（无词义，不做成分）if，whether （表达是否的意义，但不做句子成分）； 连接代词：who，whom，whose，what，which，whatever，whoever，whichever（有词义，在句子中可作主语、表语、宾语）；连接副词：when，where，why，how，how many，how long，how far，however，whenever，wherever （有词义，作从句的状语）．学习时，要注意区分和掌握．

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1．Taking an exam has an evil twin called"cheating"．And some Chinese and South Korean high school students have recently had a real taste of its bitterness（痛苦）．
    They took the SAT，the US version of the college entrance exam，on Oct.11，expecting to get their results on Oct.30．However，what they found in their mailbox was an email saying that their test scores would be reviewed and delayed for up to a month because of accusation（指控） of cheating．An international official said that some students at the test centers in Asian countries had been caught checking their smart phones to get answers to SAT questio n while taking the exam．
     The incident has gotten worldwide attention as China and South Korean are the top two supplies of foreign university students in the US．If the cheating is confirmed，those students'scores could be cancelled，which worried many students，as Oct.11's test was the last SAT test this year and early applicants to US universities were due on Nov.1．
     However，the College Board，which developed the SAT，said that the review was to make sure that test-takers received valid（真实的） scores．Meanwhile，universities such as George Washington University have said that a delay in score reporting would not disadvantage applicants from those countries．
     Although there are more than 1，000 testing centers outside the US in more than 175 countries，the only testing allowed in China is at international schools，which means most Chinese students have to go to Hong Kong or another country to take the SAT．
      The problem of cheating in exams isn't unique to China．Last May，the College Board canceled an SAT testing date in South Korean after tutoring （辅导）companies were suspected to have illegally gotten SAT testing materials before the test．In 2011，twenty US students were arrested in Long Island，New York for hiring other students to take the SAT for them．

35．Why didn't the students get their test results on Oct.30？A
A．Because some students were dishonest in the exam．
B．Because some were accused of copying others'answers．
C．Because they did very badly in the exam．
D．Because they received the wrong email．
36．What may happen if the cheating is proved？C
A．They will lose many points．
B．The exam will be canceled for ever．
C．They will not be admitted to US universities．
D．They will be arrested by the US police．
37．If the scores prove valid，their admissions will be            according to the George Washington University．D
A．canceled         
B．delayed     
C．advanced        
D．unaffected
38．How many cases of cheating are ment ioned in the passage？B
A．Two．
B．Three．
C．Four．
D．Five．
18．The orangutan （红毛猩猩），the most inactive of the great apes，has unusually stable DNA，too．Researchers have just completed the sequencing （序列） of the entire genome （基因组） of our orange-haired relative，and they have found to their surprise that its DNA has changed much less dramatically over time than has that of humans or chimpanzees．"The orangutan is very unique，"says Devin Locke，a structural geneticist heading the orangutan sequencing project．
The orangutan genome had one other big surprise．Locke and colleagues sequenced six Sumatran and five Bornean orangutans，which are classified as different species．The apes have been physically separated for at least 21，000years-the last time land bridges between the two islands existed-and earlier studies estimated that they became distinct species more than 1million years ago．But the new analysis，reported online today in Nature，rewrites history：it appears they parted ways just 400，000years ago．"Most previous studies used small sets of markers and a limited amount of DNA sequence，"says Locke．"The statistical power is so much greater when you have the whole genome available．"
The orangutan now joins chimpanzees and humans as the third great ape to have its genome sequenced．"The orangutan genome is a wonderful resource，"says evolutionary geneticist Svante P??bo of the Max Planck Institute for Evolutionary Anthropology in Leipzig，Germany．"It will help clarify how each part of human and African ape genomes are related to each other and evolved．"
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A separate but related study published today in Genome Research reports yet another unexpected finding from a comparison of the three great ape genomes．A team led by Mikkel H．Schierup and Thomas Mailund of Aarhus University in Denmark （both co-authors of the Nature report） discovered that some regions of the human genome more closely resemble the orangutan than the chimpanzee．This reflects the fact that at the time humans split off from a common ancestor with chimps，both species had the same ancestral orangutan DNA．But humans and chimpanzees have evolved separately for millions of years．In the process，chimps for mysterious reasons lost some orangutan DNA that humans kept possession of．
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74．Orangutans from two islands，Sumatran and Bornean，became different species sinceD．
A．at least 21，000years ago
B．over 1million years ago
C．some 12million to 16million years ago
D.400，000years ago
75．Which of the following statements is TRUE according to this passage？B
A．Compared with the DNA of orangutan，chimpanzee's is less changed over time．
B．Only three apes'genomes have been sequenced up to now．
C．Humans'ancestors stepped on their way of evolution 12to 16millions years ago．
D．Chimpanzees gain new genes faster than orangutans do in evolution．
76．The reason of orangutan's little change in DNA is thatB．
A．this species is not as active in intelligence as humans or chimpanzees．
B．the newly identified Alu elements is believed to have played a special role
C．Alu retrotranspositions in orangutan are shut off during the course of evolution
D．orangutan's low intelligence fails to stimulate the change of its DNA
77．Some region of human genome is more similar to that of orangutan than chimp's becauseC．
A．human and orangutan share the same ancestor，but chimp doesn't
B．humans and chimpanzees have evolved separately for millions of years
C．chimps failed to hang on to orangutan DNA for some unknown reason，but human didn't
D．chimps didn't act as actively as humans，resulting in their losing some critical orangutan DNA．
7．George has promised Jane that upon her return he ______ for her at the airport．（　　）
A．will be waitingB．would have waited
C．will have waitedD．would be waiting

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