2020年英语专四考试阅读练习题附答案解析06

发布时间：2020-09-10

小伙伴们，英语专业四级考试大家复习的怎么样了呢？下面是51题库考试学习网分享的一些英语专业考试四级部分的复习资料，一起来看看吧！

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

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下面小编为大家准备了 专四专八考试 的相关考题，供大家学习参考。

We get the impression that the author seems to be ______. Hardy's impulses as a writer.

A．amazed at

B．critical of

C．fed up with

D．interested in

正确答案：B

【M9】

正确答案：never改成ever
never改成ever 解析：ever用于肯定句，表示“一直地、总是、永远”的意思。

Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications enables people to sand and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for delivering news, data, information, and entertainment.

Telecommunications devices convert different types of information, such as sound and video, into electronic or optical signals. Electronic signals typically travel along a medium such as copper wire or are carried over the air as radio waves. Optical signals typically travel along a medium such as strands of glass fibers. When a signal reaches its destination, the device on the receiving end converts the signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen.

Telecommunications messages can be sent in a variety of ways and by a wide range of devices. The messages can be seat from one sender to a single receiver (point-to-point) or from one sender to many receivers (point-to-multipoint). Personal communications, such as a telephone conversation between two people or a facsimile (fax) message (see Facsimile Transmission), usually involve point-to-point transmission. Point-to-multipoint telecommunications, often called broadcasts, provide the basis for commercial radio and television programming.

Telecommunications begin with messages that are converted into electronic or optical signals. Some signals, such as those that carry voice or music, are created in an analog or wave format, but may be converted into a digital or mathematical format for faster and more efficient transmission. The signals are then sent over a medium to a receiver, where they are decoded back into a form. that the person receiving the message can understand. There are a variety of ways to create and decode signals, and many different ways to transmit signals.

Individual people, businesses, and governments use many different types of telecommunications systems. Some systems, such as the telephone system, use a network of cables, wires, and switching stations for point-to-point communication. Other systems, such as radio and television, broadcast radio signals over the air that can be received by anyone who has a device to receive them. Some systems make use of several types of media to complete a transmission. For example, a telephone call may travel by means of copper wire, fiber-optic cable, and radio waves as the call is sent from sender to receiver. All telecommunications systems are constantly evolving as telecommunications technology improves. Many recent improvements, for example, offer high-speed broadband connections that are needed to send multimedia information over the Internet.

Personal computers have pushed the limits of the telephone system as more and more complex computer messages are being sent over telephone lines, and at rapidly increasing speeds. This need for speed has encouraged the development of digital transmission technology. The growing use of personal computers for telecommunications has increased the need for innovations in fiber-optic technology.

Telecommunications and information technologies are merging and converging. This means that many of the devices now associated with only one function may evolve into more versatile equipment. This convergence is already happening in various fields. Some telephones and pagers are able to store not only phone numbers but also names and personal information abo

A．Current development.

B．Transmission of message.

C．Computer networking.

D．Government regulation.

正确答案：D

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