考前冲刺:2021年考研初试英语模拟试题(2020-09-02)
发布时间:2020-09-02
2021年考研初试备考时间已经不多,相信大家都已经开始了最后的复习。在复习时,适当的试题练习可以加深我们对知识点的记忆。下面,51题库考试学习网为大家带来考研英语的一些模拟试题,正在备考的小伙伴赶紧练起来吧。
At 18,Ashanthi DeSilva of suburban Cleveland is a
living symbol of one of the great intellectual achievements of the 20th
century. Born with an extremely rare and usually fatal disorder that left her
without a functioning immune system (the “bubble-boy disease,” named after an earlier victim who was kept
alive for years in a sterile plastic tent), she was
treated beginning in 1990 with a revolutionary new therapy that sought to
correct the defect at its very source, in the genes
of her white blood cells. It worked. Although her last gene-therapy treatment
was in 1992, she is completely healthy with
normal immune function, according to one of the doctors
who treated her, W. French Anderson of the
University of Southern California. Researchers have long dreamed of treating
diseases from hemophilia to cancer by replacing mutant genes with normal ones.
And the dreaming may continue for decades more. “There will be a gene-based treatment for essentially every disease,” Anderson says, “within 50 years.”
It\\'s not
entirely clear why medicine has been so slow to build on Anderson\\'s early
success. The National Institutes of Health budget office estimates it will
spend $432 million on gene-therapy research in 2005, and there is no shortage of promising leads.
The therapeutic genes are usually delivered through viruses that don\\'t cause
human disease. “The virus is sort of like a Trojan
horse,” says Ronald Crystal of New York
Presbyterian/Weill Cornell Medical College. “The cargo is the gene.”
At the
University of Pennsylvania\\'s Abramson Cancer Center, immunologist Carl June recently treated HIV
patients with a gene intended to help their cells resist the infection. At
Cornell University, researchers are pursuing
gene-based therapies for Parkinson\\'s disease and a rare hereditary disorder
that destroys children\\'s brain cells. At Stanford University and the Children\\'s
Hospital of Philadelphia, researchers are trying to figure
out how to help patients with hemophilia who today must inject themselves with
expensive clotting drugs for life. Animal experiments have shown great promise.
But
somehow, things get lost in the
translation from laboratory to patient. In human trials of the hemophilia
treatment, patients show a response at first, but it fades over time. And the field has
still not recovered from the setback it suffered in 1999, when Jesse Gelsinger, an 18-year-old with a rare metabolic
disorder, died after receiving an
experimental gene therapy at the University of Pennsylvania. Some experts worry
that the field will be tarnished further if the next people to benefit are not
patients but athletes seeking an edge. This summer, researchers at the Salk Institute in San
Diego said they had created a “marathon mouse” by implanting a gene that enhances running
ability; already, officials at the World
Anti-Doping Agency are preparing to test athletes for signs of “gene doping.” But the principle is the same, whether
you\\'re trying to help a healthy runner run faster or allow a muscular-dystrophy
patient to walk. “Everybody recognizes that gene
therapy is a very good idea,” says Crystal. “And eventually it\\'s going to work.”
1. The
case of Ashanthi Desilva is mentioned in the text to ____________.
[A] show
the promise of gene-therapy
[B] give
an example of modern treatment for fatal diseases
[C]
introduce the achievement of Anderson and his team
[D]
explain how gene-based treatment works
2.
Anderson‘s early success has
________________.
[A]
greatly speeded the development of medicine
[B]
brought no immediate progress in the research of gene-therapy
[C]
promised a cure to every disease
[D] made
him a national hero
3. Which
of the following is true according to the text?
[A]
Ashanthi needs to receive gene-therapy treatment constantly.
[B]
Despite the huge funding, gene researches have shown few
promises.
[C]
Therapeutic genes are carried by harmless viruses.
[D]
Gene-doping is encouraged by world agencies to help athletes get better scores.
4. The
word “tarnish” (line 5, paragraph 4)
most probably means ____________.
[A]
affect
[B] warn
[C]
trouble
[D] stain
5. From
the text we can see that the author seems ___________.
[A]
optimistic
[B]
pessimistic
[C]
troubled
[D]
uncertain
答案:A B C D A
以上就是51题库考试学习网为大家带来的全部内容,希望能给大家一些帮助。51题库考试学习网提醒:2021年考研预报名将在九月下旬开始,在复习的时候,小伙伴们也要记得报名哦。最后,51题库考试学习网预祝准备参加2021年考研的小伙伴都能取得优异的成绩。
下面小编为大家准备了 研究生入学 的相关考题,供大家学习参考。
A.槟榔
B.仙鹤草冬芽
C.使君子
D.雷丸
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