7.Researchers in China and the United States have developed a new cataract(白內(nèi)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(晶體)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(并發(fā)癥)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.
分析 本文講述了一種新的用干細(xì)胞來(lái)治療白內(nèi)障的方法.這種方法更安全更有效,在將來(lái)會(huì)被廣泛接受的.
解答 32-35.BDBA
32.B 考查主旨大意.根據(jù)第一句話"Researchers in China and the United States have developed a new cataract(白內(nèi)障)treatment with cells that has restored vision in babies in a trial and may eventually be used in adults"可知,本文主要講述了一種新的用干細(xì)胞來(lái)治療白內(nèi)障的方法.故選B.
33.D 考查細(xì)節(jié)理解.根據(jù)"It resulted in fewer complications(并發(fā)癥)than the current harmful operation"可知,這種方法比目前使用的方法更安全.故選D.
34.B 考查推理判斷.根據(jù)"while 25 babies received thee standard operation care"可知,有越來(lái)越多的人接受了這種新的治療方案,所以將來(lái)這種方法會(huì)被廣泛接受.故選B.
35.A 考查詞意猜測(cè).根據(jù)"birth or shortly after-is important cause of blindness in children"可知,"congenital cataract-lens"是指一出生或出生不久就患病,所以該詞的意思是"先天性的".故選A.
點(diǎn)評(píng) 閱讀理解考察學(xué)生的細(xì)節(jié)理解和推理判斷能力,做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確的選擇.在做推理判斷題不要以個(gè)人的主觀想象代替文章的事實(shí),要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷.