试题与答案

计算机病毒具有很多特性,以下 Ⅰ.传染性 Ⅱ.破坏性 Ⅲ.隐蔽性 Ⅳ.潜伏性

题型:单项选择题

题目:

计算机病毒具有很多特性,以下
Ⅰ.传染性 Ⅱ.破坏性 Ⅲ.隐蔽性
Ⅳ.潜伏性 Ⅴ.可激发性
( )是计算机病毒固有的特征。

A.Ⅰ和Ⅱ

B.Ⅰ、Ⅱ和Ⅳ

C.Ⅰ、Ⅱ、Ⅱ和Ⅳ

D.Ⅰ、Ⅱ、Ⅲ、Ⅳ和Ⅳ

答案:

参考答案:D

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题型:单项选择题

Passage Four

What began with the invention of the telephone in 1876 has today become a global net of cables, satellites, transmitters, and receivers that enables half the population of the planet to exchange works, data, and images in seconds. It could take less than 25 years more to give the other half of the world’s people this same power.
The unified global telecommunications system, which is called "the Meganet’, represents the greatest construction project ever undertaken. If present trends continue, by early in the 21st century the Meganet will link every computer terminal, fax machine, databank, and telephone instrument on earth.
Unlike its anarchic (无政府主义的) cousin the Internet, which evolved from free interaction among interest groups of computer users, the Meganet of local telephone service, long-distance lines, communications satellites, and mobile relays has been planned, constructed, regulated and largely sponsored by governments and for-profit business interests. As new materials and technologies bring reliable voice and data links to formerly isolated or closed communities, political and economic power struggles grow.
The Meganet breaks long-established patterns of social identity and responsibility. Where private individuals have uncensored access to global information sources, local standards of legality or decency become difficult even to set, let alone to enforce. Economic values may shift, too. Public utility companies have long supplied electric power over miles of high-tension lines, or pumped water through underground pipelines into thousands of homes. Now they are finding that their power-line rights-of-way and physical into-home connections let them compete with cable TV and phone companies to supply information services as well.
Meganet impacts are often double-edged for finance and business, too. New York’s Wall Street district lost 20% of its work force—some 100 000 jobs—in less than a decade, as computers took over tasks once performed by clerks and banks did more of their business by phone transfers and automated teller machines.

"The Meganet" is ______ .

A.sponsored by governments

B.similar to its cousin the Internet

C.the continuity of the Internet

D.evolved from spontaneous interaction among interest groups of computer users

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题型:单项选择题

科学家做过如下实验,把含有生长素的琼脂块放在一段燕麦胚芽鞘的形态学上端,把不含生长素的琼脂块作为接收块放在下端;另一实验是把一段燕麦胚芽鞘倒转过来,把形态学下端朝上,做同样的实验。请分析,经过一段时间后,接收块甲和接收块乙的成分有何变化()

 

A.甲含有生长素,乙不含有

B.乙含有生长素,甲不含有

C.甲、乙都含有生长素

D.甲、乙都不含有生长素

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题型:单项选择题

2014年中央经济工作会议提出保障民企平等享有用地、税费减免等一系列针对“放活”民间投资的普惠政策,推动国企从一般竞争性领域退出,在电网、电信、铁路等非竞争性领域,逐步扩大民间投资参与力度。“放活”民间投资普惠政策的意义在于()

A.依法平等使用生产要素参与市场竞争

B.有效发挥非公有制经济的主导作用

C.确立非公有制经济在我国经济社会发展中的基础地位

D.提高国有经济资产的数量和质量

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