The reason for your mistakes is because you lack confidence in yourself．because改为that．题目和参考答案——青夏教育精英家教网—

题目内容

2．The reason for your mistakes is because you lack confidence in yourself．because改为that．

分析你犯错误的原因是你缺乏对自己的自信．

解答答案：because改为that 考查句子改错．reason后接句意完整的表语从句时引导词用that，不用because．

点评单句改错涉及词汇、语法、句型结构等方面的知识和逻辑情理的推断和综合辨析能力，是一种在较高层次上考查考生对英语知识的掌握和语言综合运用能力的测试题型．它是专门针对考生们平时学习英语过程中，尤其是写作练习中常犯的又是较为普遍的错误而设计的．

练习册系列答案

8．There are two good Chinese restaurants within walkingdistance（距离） of my house．

10．The headmaster visited different classrooms andenjoyed（enjoy）performances by students last Monday．

17．But the pursuit of the American dream ________ quickly turn into a nightmare，experts warn，as many of these socalled parachute kids live in the US with little parental supervision．（　　）

7．Researchers in China and the United States have developed a new cataract（白内障）treatment with cells that has restored vision in babies in a trial and may eventually be used in adults．
The treatment-by doctors and staff members at the University of California，San Diego School of Medicine and Sichuan and Sun Yat-sen universities in China-was published in March 9edition of the scientific journal Nature．
A cataract is a clouding of the normally clear lens（晶体）of an eye．Typical cataract operation involves the removal of the cloudy lens and the insertion of an artificial one．The new operation has been tested in animals and during a small，human trial．It resulted in fewer complications（并发症）than the current harmful operation，and in regrown lenses with superior visual function in all 12of the baby cataract patients who received the procedure．
A congenital cataract-lens clouding that occurs at birth or shortly after-is important cause of blindness in children．In the new research，Kand Zhang，head of ophthalmic genetics at US San Diego's Shiley Eye Institute，and his colleagues relied on the regrown potential of endogenous（同源的）stem cells．
According to Zhang，endogenous stem cells are different from other stem cells that are typically grown in a laboratory，transplanted into a patient，and can have risks of immune（免疫的）rejection，infection or cancers．Zhang told CBS News，"We invented a new operation to make a very small opening at the side of a cataractous lens bag，remove the cataract inside，allow the opening to heal，and promote potential lens stem cells to regrow an entirely new lens with vision．"
The human trial involved 12 babies under the age of 2 who were treated with the new method，while 25 babies received thee standard operation care..The latter group experienced a higher incidence of pos-operation danger，early-onset eye high blood pressure and increased lens clouding．The scientists reported fewer complications and faster healing among the 12 babies who has the new procedure．

32．What is the text mainly about？B
A．The concept of the cataract
B．A new cataract treatment with stem cells
C．Bad effects of post-operation in the cataract
D．The reasons why the cataract comes into being
33．Which of the following best describe the new cataract treatment according to the passage？D
A．Convenient B．Comfortable C．Cheap D．Safe
34．What can we learn about the new cataract treatment？B
A．It has more risks
B．It may be used widely
C．It has been put into practice widely
D．It can only restore vision in babies
35．What does the underlined word"congenital"in the fourth paragraph mean？A
A．Born B．Strange C．Serious D．Dangerous．

14．Mr．Jackson was tired of living in his old house in the countryside and wanted to sell it and buy a better one．He tried to sell it for a long time，but was not successful，so at last he decided to go to an estate agent（房产经纪人）．
The agent advertised the house straight away，and a few days later，the owner saw a very beautiful photograph of his house，with a wonderful description of his garden in an expensive magazine．
Having read the advertisement through，the house owner hurried to phone the estate agent，saying，"I'm sorry，Mr．Jones，but I've decided not to sell my house after all．""Why？"the agent asked in a surprised voice．"Because from the advertisement in that magazine I can see it's just the kind of house I've wanted to live in all my life．"

29．Mr．Jackson wanted to sell his house becauseD．
A．he needed some money to support his family
B．his house was too old to live in
C．he wanted some money to buy a new one
D．he didn't want to live in the house any longer
30．The reason why Mr．Jackson went to the estate agent wasA．
A．he had failed in selling his house by himself
B．he wanted the estate agent to help him to get a good price
C．he was sure that the estate agent could help him
D．he wanted the estate to advertise his house in the magazine
31．At last Mr．JonesB．
A．was successful in selling the house
B．felt sorry to have lost a sale by his doing too good a job
C．was satisfied with what he had done in the advertisement
D．didn't understand why Mr．Jackson had changed his mind
32．What do you think of the advertisement in magazines？B
A．They are worth reading．
B．They usually make things far better than they really are．
C．They are a great help to those who want to buy something．
D．They describe things as they really are．

11．Conventional wisdom has it that we should some money for rainy days when we have a lot in hand．（　　）

12．Measles （麻疹），which once killed 450 children each year and disabled even more，was nearly wiped out in the United States 14 years ago by the universal use of the MMR vaccine （疫苗）．But the disease is making a comeback，caused by a growing anti-vaccine movement and misinformation that is spreading quickly．Already this year，115 measles cases have been reported in the USA，compared with 189 for all of last year．
The numbers might sound small，but they are the leading edge of a dangerous trend．When vaccination rates are very high，as they still are in the nation as a whole，everyone is protected．This is called"herd immunity"，which protects the people who get hurt easily，including those who can't be vaccinated for medical reasons，babies too young to get vaccinated and people on whom the vaccine doesn't work．
But herd immunity works only when nearly the whole herd joins in．When some refuse vaccination and seek a free ride，immunity breaks down and everyone is in even bigger danger．
That's exactly what is happening in small neighborhoods around the country from Orange County，California，where 22 measles cases were reported this month，to Brooklyn，N．Y．，where a 17-year-old caused an outbreak last year．
The resistance to vaccine has continued for decades，and it is driven by a real but very small risk．Those who refuse to take that risk selfishly make others suffer．
Making things worse are state laws that make it too easy to opt out （决定不参加） of what are supposed to be required vaccines for all children entering kindergarten．Seventeen states allow parents to get an exemption （豁免），sometimes just by signing a paper saying they personally object to a vaccine．
Now，several states are moving to tighten laws by adding new regulations for opting out．But no one does enough to limit exemptions．
Parents ought to be able to opt out only for limited medical or religious reasons．But personal opinions？Not good enough．Everyone enjoys the life-saving benefits vaccines provide，but they'll exist only as long as everyone shares in the risks．

32．The first two paragraphs suggest thatA
A．a small number of measles cases can start a dangerous trend
B．the outbreak of measles attracts the public attention
C．anti-vaccine movement has its medical reasons
D．information about measles spreads quickly
33．Herd immunity works well whenB
A．exemptions are allowed
B．the whole neighborhood is involved in
C．several vaccines are used together
D．new regulations are added to the state laws
34．What is the main reason for the comeback of measles？A
A．The vaccine opt-outs of some people．
B．The lack of medical care．
C．The features of measles itself．
D．The overuse of vaccine．
35．What is the purpose of the passage？B
A．To introduce the idea of exemption．
B．To stress the importance of vaccination．
C．To discuss methods to cure measles．
D．To appeal for equal rights in medical treatment．

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