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A.User accounts
B.Log files
C.Operating systems
D.Passwords
答案
更多“What can a hacker destroy or modify to make a server or network intrusion undetectable”相关的问题
第1题
The source of the sun' s inconstancy is magnetism. Professor William Livingston has developed new theories about its magnetic nature.
"We don' t yet know what causes sun spots, "he says, "but we now think they ' re areas of high level magnetism that come up from the sun' s interior. So strong is their magnetic pull that the highly ionized gas nearby is not able to transmit energy out. "As a result these areas send out less heat and light and thus appear from Earth to be almost dark irregular surface patches.
Sun spot activity generally fluctuates in steady, 11-year cycled. Scientists have long formed the o pinion that as the size and number of sun spots increased, the overall energy sent out by the sun would de crease. Indeed, recent studies confirmed it, revealing that during peak periods of sun spot activity, the Earth experiences a small drop that can be seen clearly in received solar energy.
Could such a small drop in energy have an effect here on earth？ Perhaps some scientists think the world temperature could fall by' as much as 0.2 during periods of high solar magnetism.., enough to cause significant fluctuations in weather patterns.
According to the passage, it is believed that the sun ______ ．
A．moves in a quick but steady way year after year
B．sends out less and less heat and light with each passing year
C．radiates the same amount of light every year
D．might have a strong influence on the weather patterns
第2题
We use names every day. When we meet a new person, we usually ask, "What's your name？" It is important to learn a person's name. Most people have two names. Some people have more names. Names are different all over the world. In Jenny's class, Jenny must learn the names of students from all over the world. This is very difficult because the names are very different.
In the United States, most people have a first name, a middle name, and a last name. Parents, choose the first and middle names for their baby. There are names for boys 'and names for girls. For example, John, Peter, Tom, and Mike are all names for boys. Elizabeth, Betty, Susan, and Mary are all names for girls, The last name is the family name. Usually it is the father's family name. In a family, the mother, the father, and the children usually have the same last name.
Sometimes a person has a nickname (绰号) , too: A nickname is a special name. It is not a person's real name. Abraham Lincoln's nickname was "Honest Abe". An honest person always tells the truth, and Abe is short for Abraham. Because he was an honest person, his nickname was "Honest Abe". Pele (贝利) is a nickname, too. The football player's real name is Edison Arantes de Nascimento, but everyone calls him Pele. Do you have a nickname？
Names are different all over the world. They can be long or short, but they are always very important.
Why does everything have a name？
A．It is very interesting to have a name.
B．It is very easy to be remembered.
C．It is very easy to be told from others.
D．Both B and C
第3题
A.What in earth
B.where in earth
C.What on earth
D.Where on earth
第4题
A.this
B.which
C.whose
D.what
第5题
You can' t hear what I'm saying ______ you stop talking.
A．only if
B．unless
C．lest
D．except that
第7题
What they have done for us can't be measured in______of money.
A．way
B．means
C．terms
D．place
第8题
From what Mr. Collins said, we can know that he_________ .
A．had only an incomplete picture of what happened
B．heard and saw nothing at all
C．talked to the pilot
D．was once a pilot
第9题
Not always ______ they want to.
A．people can do what
B．people cannot do what
C．can people do what
D．can' t people do what
第10题
What can we infer from the last paragraph？
A．Monkeys can be trained to develop social emotions.
B．Human indignation evolved from an uncertain source.
C．Animals usually show their feelings openly as humans do.
D．Cooperation among monkeys remains stable only in the wild.
第11题
Doctor: What seems to be the problem？ Patient:______
A．I can't bear the strain at work.
B．I strained my back at work.
C．The work bores me.
D．It's killing me.
