I soon found that the work I was doing had already been done by someone else. .I was wasting my time．( )A．to make things worseB．for another thingC．at the same timeD．in other words 题目和参考答案——青夏教育精英家教网—

题目内容

8．I soon found that the work I was doing had already been done by someone else，______，I was wasting my time．（　　）

	A．	to make things worse		B．	for another thing
	C．	at the same time		D．	in other words

分析我很快发现我正在做的工作是别人已经做过了的，换句话说，我浪费了我的时间．

解答答案：D
to make things worse更糟糕的是；for another thing另一方面，其次；at the same time同时；in other words换句话说，也就是说．句意表达的是同义解释，故选D．

点评插入语在英语中属于独立成分，它起着对一句话进行附加解释或说明的作用．它们中绝大部分可位于句首、句中或句末，并用逗号与其它成分隔开．

练习册系列答案

4．"Over the years the unthinkable has become thinkable and today we sense we are close to being able to alter human heredity（遗传）．"These were the words of David Baltimore of the California Institute of Technology，on December 1st，when he opened a three-day meeting in Washington to discuss the morality and use of human gene editing．Dr Baltimore is an old hand at these sorts of discussions，for he was also a participant in the Asilomar conference，in 1975，which brought scientists together to discuss a safe way of using the then-new tcchnology of recombinant DNA，and whose recommendations influenced a generation of biotechnology researchers．
Four decades on，the need for a similar sort of chin-wag has arisen．The International Summit on Human Gene Editing has been held by the national scientific academies of three countries-America，Britain and China．They are particularly concerned about whether gene editing should be used to make heritable changes to the human germ line，something Dr Baltimore described as a deep and troubling question．Like those of Asilomar，the conclusions of this meeting will not be binding．But the hope is that，again like Asilomar，a mixture of common sense and peer pressure will create a world in which scientists are trusted to regulate themselves，rather than having politicians and civil servants do it for them．The meeting is being held against a backdrop of rapid scientific advance，Since 2012 research into a new，easy-to-use editing tool called CRISPR-Cas9 has blossomed．This technique involves a piece of RNA （a chemical messenger，which can be used to recognise a target section of DNA） and an enzyme （酶） called a nuclease that can snip unwanted genes out and paste new ones in．
Public interest was aroused in April，when Chinese scientists announced they had edited genes in non-viable （无活力的） human embryos，and again in November when British researchers said they had successfully treated a one-year-old girl who had leukaemia （白血病），using gene-edited T-cells．T-cells are part of the immune system that attack，among other things，tumour cells．The researchers altered T-cells from a healthy donor to encourage them to recognise and kill the patient's cancer，to make them immune to her leukaemia drug，and to ensure they did not attack her healthy cells．
In another recent development，a firm called Edit as Medicine，which is based in Cambridge，Massachusetts，has said it hopes，in 2017，to start human clinical trials of CRISPR-Cas9 as a treatment for a rare genetic form of blindness known as Leber congenital amaurosis （伯氏先天性黑蒙）．Though other companies are already testing gene-editing therapies，these employ older，clunkier forms of the technology that seem likely to have less commercial potential．Moreover，researchers at the Broad Institute，also in Cambridge，said this week that they had made changes to CRISPR-Cas9 which greatly reduce the rate of editing errors-one of the main obstacles to the technique's medical use．
On the subject of germ-line editing，Eric Lander，the Broad's head，told the meeting it would be useful only in rare cases and said it might be a good idea to"exercise caution？before making permanent changes to the gene pool．The need for caution is advice that might also be heeded by those pursuing work in animals other than people，and in plants-subjects not being covered by the summit．
61．Which ofthe following is TRUE about CRISPR-Cas9？B
A．It has fewer side effects．
B．It can modify human gene．
B．It can protect immune system．
D．It has less commercial potential．
62．The underlined word"chin-wag"in Paragraph 2 can be replaced byA
A．discussion B．negotiation C．argument D．comparison
63．What can be inferred from the passage？D
A．Dr．Baltimore started his research on modiffing gene in 1975．
B．Scientists'opinions about the use of gene editing are consistent．
C．CRISPR-Cas9 has been applied to cure Leber congenital amaurosis．
D．More research should be made before the technology comes into wide use．
64．This passage is most probably aB．
A．science fiction
B．scientific report
C．conference summary
D．commercial advertisement．

1．I was in Houston a few weeks ago，and needed to be back home in Austin by midmorning the next day．Though I usually left in the evening，for some reason last time I had to choose to set off after midnight．
I was on my way back to Austin when I realized I left an important file，and knew I had to return to get it．I took the first exit I could，but when I rounded the corner，an 18-wheeler was stopped dead in the exit lane．I swerved（急转弯） to avoid it，and then I realized that there was something wrong with my car．So I pulled into a small parking lot and unsurprisingly found the area deserted at 3：15am．I've lived in urban areas most of my life．I'm fairly street-wise and don't become frightened easily，but I knew I was in a pretty tough neighborhood．
There was no one in Houston to pick me up．I immediately locked the doors and picked up my phone to call a tow truck．Soon a young man knocked on my driver's side window and asked if he could help me．Judging from his appearance，he was far from a mad man，but I knew he was far more likely to rob than help me．So I lied to him．After a while，he asked again，but this time I politely refused and told him the tow truck was due any minute．He finally said，"Madam，you need help．A tow truck in Houston will arrive anywhere between 45minutes and approximately never （which I knew was true），and you aren't going anywhere until you change your flat tire．"
After considering thoroughly，I got out．He looked surprised，but got right to work．He changed the tire，returned the seat to its place and said，"Thank you for letting me help you．You gave me a chance when most people would never open the door to someone like me．Would it be okay if I gave you a hug？"When I recovered，I gave him a giant hug．I left with a new tire and a renewed faith in human nature．

4．What's the matter with the author's car？D
A．It couldn't get started．
B．Its oil ran out．
C．It was out of control．
D．Its tire blew out．
5．Why did the author lie to the man and refuse his help in the beginning？B
A．Because she thought the man was playing jokes．
B．Because she thought the man might be a bad man．
C．Because she thought the man wanted to get a lift．
D．Because she thought the man was a mad man．
6．Which of the following can best describe the author？C
A．Stubborn but brave．
B．Impolite and dishonest．
C．Cautious and brave．
D．Generous but dishonest．
7．Which of the following might be the best title for the text？B
A．Attitude Determines Everything
B．Help in the Dead of Night
C．The Fight against Robbing on My Way
D．An Unexpected Traffic Accident．

3．Much to my surprise，the trapped girl ________ stay alive in the ruins for up to seven days with nothing to eat or drink．（　　）

13．I never expected there a chance to be sent abroad for further education．（　　）

20．I have to spend much time on my notes sure I can pass tomorrow's test．（　　）

17．The car stopped in front of a cottage and he remembered that was he lived with his grandpa 10years ago．（　　）

1．People
People is America's No．1 magazine about fascinating people．It's a guide to who and what's hot in the arts，science，business，politics，television，movies，books，music and sports．It is
published weekly．
Publisher：The Time Inc．Magazine Company
Cover Price：＄211.47
Our Price：＄117.00
Issues：53 issues/12 months
Lucky
Lucky is the shopping magazine with the best buys，and the fashion tips you'll need before you hit the stores．What makes Lucky really special is that it gets you the information you need before anyone else has it．
Publisher：Conde Nast Publications Inc．
Cover Price：＄35.40
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Issues：12 issues/12 months
Parents
The most trusted magazine for parents who want to raise smart，loving and self-confident children．Each issue has age-specific child-development guidance，advice on your child's health and safety，and the best ways to encourage your child's learning．
Publisher：Meredith Corporation
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    Issues：12 issues/12 months
Entertainment
    This magazine covers movies，television，music，Broadway stage productions，books，and popular culture．Unlike celebrity-focused magazines like People，its main concentration is on entertainment media and reviews．It's intended for a more general audience．
    Publisher：The Time Inc．Magazine Company
    Cover Price：＄199.50
    Our Price：＄38.95
    Issues：57 issues/12 months

66．Which of the following targets common readers？B
    A．Lucky．          B．Entertainment．     C．Parents．        D．People．
67．According to the passage，what makes Lucky so special？A
    A．Its exclusive information related to shopping．
    B．Its pictures of fashion stores．
    C．The access it provides to bargains．
    D．Its competitive price．
68．Celebrity-focused magazines are probably ones focusing onC．
    A．political events
    B．festivals and celebrations
    C．hot events and famous stars
    D．television programs
69．You're most likely to find the above informationB．
    A．in an educational magazine           B．on a magazine club website
    C．in a guide to magazines              D．in a magazine sales report
70．Dcosts the subscriber least．
    A．Lucky            B．Parents          C．People           D．Entertainment．

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