问题 单项选择题

下面关于计算机病毒的叙述中,不正确的是______。

A.计算机病毒有破坏性,凡是软件作用到的计算机资源,都可能受到病毒的破坏

B.计算机病毒有潜伏性,它可能长期潜伏在合法的程序中,遇到一定条件才开始进行破坏活动

C.计算机病毒有传染性,它能不断扩散,这是计算机病毒最可怕的特性

D.计算机病毒是开发程序时未经测试而附带的一种寄生性程序,它能在计算机系统中存在和传播

答案

参考答案:D

解析:计算机病毒是指能够侵入计算机系统并在计算机系统中潜伏、传播、破坏系统正常工作的一种具有繁殖能力的程序。它不是开发程序时未经测试而附带的一种寄生性程序。

单项选择题
阅读理解

In a six-week study, experts found people who played online games designed to improve their cognitive(认知的) skills didn't get any smarter.

More than 8,600 people aged 18 to 60 were asked to play online brain games designed by the researchers to improve their memory, reasoning and other skills for at least 10 minutes a day, three times a week. They were compared to more than 2,700 people who didn't play any brain games, but spent a similar amount of time surfing the Internet and answering general knowledge questions. All participants were given a sort of I.Q test before and after the experiment.

Researchers said the people who did the brain training didn't do any better on the test after six weeks than people who had simply been on the Internet. On some sections of the test, the people who surfed the Net scored higher than those playing the games.

"If you're (playing these games) because they're fun, that's absolutely fine," said Adrian Owen, the study's lead author. "But if you're expecting (these games) to improve your I.Q., our data suggests this isn't the case," he said during a press briefing on Tuesday.

One maker of brain games said the company's games have been proven to boost brain power.

"Their conclusion would be like saying, 'I cannot run a mile in under 4 minutes and therefore it is impossible to do so," Aldrich said in a statement.

"There is precious little evidence to suggest the skills used in these games transfer to the real world," said Art Kramer, who was not linked to the study and has no ties to any companies that make brain training games.

Instead of playing brain games, Kramer said people would be better off getting some exercise. He said physical activity can spark(激发) new connections between nerves and produce new brain cells. "Fitness changes the building blocks of the brain's structure," he said.

小题1:. It can be inferred that the online brain games mentioned in the text are_____________.

A.costly

B.unreliable

C.illegal

D.effective小题2:. Which of the following statements is true about the experiment in the second paragraph?

A.The experiment lasted for a week.

B.Age didn’t affect the result of the research.

C.Every person played online brain games three times a day.

D.People who didn’t play online brain games did better in I.Q test小题3:. What can we learn from the text?

A.Playing games which are fun can improve your I.Q.

B.There is a lot of evidence to suggest skills can transfer to the real world.

C.Do physical activity can boost your brain power.

D.Playing online games can spark new brain cells小题4:The underlined sentence suggests that ___________.

A.The research was not linked to the study

B.Those playing the games can score higher in the test

C.playing the games can spark new connections between nerves

D.This isn’t the case that these games can improve your I.Q.