问题 单项选择题

()属于覆盖病毒特征。

A.病毒在感染时,将病毒代码加入正常程序中,原来程序的功能部分或者全部被保留

B.病毒直接用病毒程序替换被感染的程序

C.病毒不改变原来的文件,只是伴随创建一个病毒文件

D.首先检查系统内存,查看内存是否已有此病毒存在;如果没有则将病毒代码装入内存进行感染。

答案

参考答案:B

填空题
阅读理解

阅读理解

     Autumn means different things to different people.It all depends on your personality,said British

naturalist Richard Mabey."Personality shapes your view of the season," he said."You may see it as a fading away,a packing up (结束),or as a time of packing in another sense-the excited gathering of resources

before a long journey."

     If this is true,perhaps it tells us a little about,for instance,Thomas Hood,the 19th century English poet.

About November,he wrote:

     No warmth,no cheerfulness,no healthful ease

     No shade,no shine,no butterflies,no bees

     November!

     On the other hand,another English poet John Keats,already sensing he was seriously ill,was inspired by a late September day to pen one of the most famous poems in the English language,To Autumn.He wrote

to a friend afterwards that there was something comforting and healing about it.

     According to Richard Mabey,Keats has the biological evidence on his side.Autumn is not a time of

slowing down,but a time of new beginnings and great movements of creatures.For example,just at the

moment that Keats's "gathering swallows" (in To Autumn) are departing for Africa,millions of creatures are fleeing from the frozen north like Iceland,Greenland and Russia to winter along the east and south coasts of Britain.According to scientists,before falling,the leaves transfer their chlorophyll (叶绿素) and

carbohydrates into the woody parts of the tree for safekeeping over winter.What remains are the natural

antioxidants (防老剂) in the leaves:the yellow and orange carotenoids (类胡萝卜素),and another

protective chemical specially produced for autumn,the brightred anthocyanin (花青素).High color is not a signal of deterioration (退化) and decline,but of detox (排毒的) ability and good health.

     A century after Keats,the American poet Loren Eiseley wrote in his journal:"Suppose we saw ourselves burning like maples in a golden autumn,and that we could disintegrate (分解) like autumn leaves...dropping their substance like chlorophyll.Would_not_our attitude_towards death_be_different?"

1. From Thomas Hood's poem,we may infer that________.

A. he suffered a lot from cold November

B. he missed the shining summer days very much

C. he had a negative attitude towards autumn

D. he enjoyed butterflies and bees very much

2. Which word can best describe John Keats's attitude towards autumn?

A. Optimistic.  

B. Fearful.  

C. Doubtful.  

D. Realistic.

3. In autumn,leaves turn yellow before falling because________.

A. they can't bear the freezing

B. they can't get enough water from the woody part

C. chlorophyll and carbohydrates have been lost through leaves

D. chlorophyll and carbohydrates have come back to the woody part.

4. What does the underlined sentence mean?

A. Man can never live long,just as leaves must leave the tree annually.

B. Man is different from autumn leaves,which will come again the next spring.

C. Man should treat death calmly,just like autumn leaves fall to the ground.

D. Man should have a positive attitude towards death,quite different from autumn leaves.