问题 选择题

下列物质中属于有机物的是

A.纯碱

B.干冰

C.小苏打

D.酒精

答案

答案:D

A、碳酸钠中虽然含有碳元素,但是碳酸钠的性质和无机物相似,属于无机物.故选项错误

B、二氧化碳虽然是含碳的化合物,但其性质与无机物相似,常归为无机物,故选项错误.

C.碳酸氢钠中虽然含有碳元素,但是碳酸氢钠的性质和无机物相似,属于无机物,故选项错误

D、乙醇是由碳、氢、氧三种元素组成的,是一种含碳的化合物,属于有机物,故选项正确

问答题
阅读理解

“I Love You”Virus

On May 21,1999,some American scientists were working at the computers to look for information they needed.Suddenly they saw a lot of very bright red spots crossing the computers’screens.At the same time the computers were working much slower.To find out what was happening they stopped their work to check some parts of the computers.To their horror,they found out that most of their stored information was got rid of by computer virus! Obviously all these computers had been infected by computer virus.

It is said that the computer virus was made by two or three Philippine young men fond of playing tricks.They all had excellent education.They created the virus just to show their intelligence.The kind of computer virus is named“I Love You”Virus.This virus can hide in computers for long.When the time comes it will attack the computers by lowering the important functions,damaging their normal programs or even getting rid of a great deal of information which operators of the computers often use or store;even worse,it still can reproduce itself in great quantities within a short time.

We come to know that “I Love You”Virus often attacks computers on Mondays and that it is spreading to many computers in the world.Among the countries that suffered computer viruses last year are Britain,Australia,Switzerland and the US.Those who made the computer viruses have been found out slowly and carefully.But till now,how to get rid of the terrible viruses remains a problem.

61.In 1999,the virus made American scientists’information______.

A.all lost            B.partly lost                  C.none lost        D.mostly lost

62.The most terrible character“I Love You”Virus is______.

A.it can hide in computers for long

B.it can damage computer’s normal programs

C.it can get rid of all the information that the operator stores

D.it can reproduce itself in great quantities in a short time

63.All the following countries have been attacked by“I Love You”Virus EXCEPT______.

A.Britain            B.Australia                   C.Switzerland     D.Japan

64.According to the passage,which is NOT true about“I Love You”Virus?

A.Have found who made it                      B.Have found the solution to it

C.Have been attacked by it                      D.Have no effective method to it