专项练习:2021年考研英语阅读模拟题(三十八)
发布时间:2020-10-23
英语是考研初试当中比较拉分的科目,历来令不少考生又爱又恨。许多考生的英语都有很大的进步空间,因此英语该如何学就成为了众多考生关心的重点。想要学好英语,实战经验很重要。下面,51题库考试学习网为大家带来考研初试英语科目的一些模拟试题,正在备考的小伙伴赶紧练起来吧。
Scientists
have known since 1952 that DNA is the basic stuff of heredity. They\'ve known
its chemical structure since 1953. They know that human DNA acts like a
biological computer program some 3 billion bits long that spells out the
instructions for making proteins, the basic building blocks of
life.
But
everything the genetic engineers have accomplished during the past half-century
is just a preamble to the work that Collins and Anderson and legions of
colleagues are doing now. Collins leads the Human Genome Project, a 15-year effort to draw the first detailed
map of every nook and cranny and gene in human DNA. Anderson, who pioneered the first successful human
gene-therapy operations, is leading the campaign to put
information about DNA to use as quickly as possible in the treatment and
prevention of human diseases.
What they
and other researchers are plotting is nothing less than a biomedical
revolution. Like Silicon Valley pirates reverse-engineering a computer chip to
steal a competitor\'s secrets, genetic engineers are decoding
life\'s molecular secrets and trying to use that knowledge to reverse the
natural course of disease. DNA in their hands has become both a blueprint and a
drug, a pharmacological substance of
extraordinary potency that can treat not just symptoms or the diseases that
cause them but also the imperfections in DNA that make people susceptible to a
disease.
And
that\'s just the beginning. For all the fevered work being done, however, science is
still far away from the Brave New World vision of engineering a perfect human—or even a perfect tomato. Much more research
is needed before gene therapy becomes commonplace, and many diseases will take decades to conquer, if they can be conquered at all.
In the
short run, the most practical way to use the
new technology will be in genetic screening. Doctors will be able to detect all
sorts of flaws in DNA long before they can be fixed. In some cases the
knowledge may lead
to
treatments that delay the onset of the disease or soften its effects. Someone
with a genetic predisposition to heart disease, for example, could follow a low-fat diet. And
if scientists determine that a vital protein is missing because the gene that was
supposed to make it is defective, they might be able to give the
patient an artificial version of the protein. But in other instances, almost nothing can be done to stop the
ravages brought on by genetic mutations. (409 words)
1. It can
be inferred from the text that Collins and Anderson and legions of colleagues
_____.
[A] know
that human DNA acts like a biological computer program
[B] have
found the basic building blocks of life
[C] have
accomplished some genetic discovery during the past half-century
[D] are
making a breakthrough in DNA
2.
Collins and Anderson are cited in the text to indicate all the following EXCEPT
that ______.
[A]
time-consuming effort is needed to accomplish the detailed map of in human DNA
[B] human
gene-therapy operations may be applied to the patients
[C]
gene-therapy now is already generally used to the treatment and prevention of
human diseases
[D]
information about DNA may be used in the treatment and prevention of human
diseases
3. The
word “pirate” (line 2, paragraph 3)
means______.
[A] one
who robs at sea or plunders the land from the sea
[B] one
who makes use of or reproduces the work of another without authorization
[C] to
take (something) by piracy
[D] to
make use of or reproduce (another\'s work) without authorization
4. We can
draw a conclusion from the text that_____.
[A]
engineering a perfect human is not feasible for the time being
[B] it‘s impossible for scientists to engineer a
perfect tomato
[C] many
diseases will never be conquered by human beings
[D]
doctors will be able to cure all sorts of flaws in DNA in the
long run
5. The
best title for the text may be ______.
[A] DNA
and Heredity
[B] The
Genetic Revolution
[C] A
Biomedical Revolution
[D] How
to Apply Genetic Technology
参考答案:DCBAB
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