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更多“virus（）”相关的问题
A.可以使用抗生素来治疗这种虫媒病
B.塞卡病毒属于细菌病毒
C.为了预防该传染病，要尽量消灭蚊虫，这属于保护易感人群
D.患者和塞卡病毒的携带者都是该病的传染源
A.患者和寨卡病毒的携带者都是该病的传染源
B.寨卡病毒属于细菌病毒
C.为了预防该传染病，要尽量消灭蚊虫，这属于保护易感人群
D.可以使用抗生素来治疗这种虫媒病
A.该病毒仅含有核糖体这一种细胞器
B.该病毒核酸的复制需要宿主细胞的呼吸作用提供能量
C.该病毒的遗传物质可直接整合到宿主细胞的染色体中
D.该病毒感染人体后，其遗传信息的传递与乙肝病毒相同
A.affected
B.infected
C.effected
D.defected
There are three main types of influenza virus. The most important of these are types A and B, each of them having several sub-groups. With the instruments at the hospital the doctor recognized that the outbreak was due to a virus group A, but he didn't know the sub-group. He reported the outbreak to the World Health Organization in Geneva. WHO published the important news alongside reports of a similar outbreak in Hong Kong, where about 15%～20% of the population had become ill.
As soon as the London doctors received the package of throat samples, they began the standard tests. They found that by reproducing itself at very high speed, the virus had multiplied more than a million times within two days. Continuing their careful tests, the doctors checked the effect of drugs used against all the known sub-groups of type A virus. None of them gave any protection. This then, was something new; a new influenza virus against which the people of the world had no ready help whatsoever.
Having isolated the virus they were working with, the doctors now conducted tests on some specially selected animals, which contracted influenza in the same way as human beings did. In a short time the usual sign of the disease disappeared. Theses experiments revealed that the new virus spread easily, but that it was not a killer. Scientists, like the general public, called it simply "Asian" flu.
The influenza discovered by a doctor in Singapore is caused by ______.
A．a new type of virus
B．type A virus
C．a sub-group of type B virus
D．a virus only existing in Asia
H-live-n-one virus in the passage means ______.
A. farm birds
B. infected farm animals
C. people died in Hong Kong
D. a different kind of bird flu virus
A computer virus ______.
A．is the same as a biological virus
B．is also an organism
C．is a series of electronic commands
D．is one of biological viruses
The virus told each computer to make many copies of itself. Within a few minutes, all the computers' power was being used to make copies of the virus. The computer could do no other work. It finally slowed down greatly, or simply stopped working. Computer experts spent many days trying to destroy the virus in the computer system.
The experts agree the virus could have been much worse. They say it could have sent orders to destroy huge amounts of electronic information.
Many experts believe, the recent computer virus showed the need for better computer security (安全). But that is a problem. The affected system provides a free exchange (交换) of ideas and information among universities, private companies and government offices. Increasing security too much would destroy this exchange. It would slow progress on many important research projects.
Which of the following statements is true？
A．Many computers were attacked by a virus in the U. S.
B．Many computers attacked by a virus in the U.S. lost their information.
C．A computer virus can harm human body.
D．A computer virus can help the computer owner do many things.
