问题 选择题

下列有关森林的叙述中,错误的是:

A.森林占据了广大的地区,导致耕地减少,因此森林越多不一定就越好

B.森林是各种动物生活的理想居所,破坏了森林,就破坏了动物的家

C.我们所使用的木材、石油及煤都直接或间接地来自于森林

D.森林能美化我们居住的环境,促进我们的身心健康

答案

答案:A

题目分析:在林木茂盛的地区,地表径流只占总雨量的10%以下;平时一次降雨,树冠可截留15-40%的降雨量;枯枝落叶持水量可达自身干重2-4倍;每公顷森林土壤能蓄水640-680吨;5万亩森林相当于100万立方米贮量的水库,因此森林能保持水土,涵养水源;绿色植物依靠光合作用维持生长,吸收二氧化碳,释放出人类维持生命的氧气,因此.绿色植物能进行光合作用吸收二氧化碳,释放氧气,大多数陆生植物的根在地下分布深而广,形成庞大的根系,比地上的枝叶系统还发达.可谓“根深叶茂”,“树大根深”,森林的根系可以牢牢的抓住土壤,防止水土流失.在风害区营造防护林带,在防护范围内风速可降低30%左右;根系可以固沙.绿色植物进行蒸腾作用增加大气的湿度,增加了降水,促进了生物圈的水循环,从而能调节气候.森林占据了广大的地区,导致耕地减少,因此森林越多不一定就越好,是错误的.故选:A.

阅读理解

阅读理解。

    Jonathan James looks like just another kid about to graduatefrom high school. But this 19-year-old

Swede is anything but ordinary from the computer in his parents' home, he helps the US Federal Bureau of Investigation (FBI) find out the world's most wanted cybercriminals.    

    Jonathan first made headlines when he and another Swede, Fredrik Bjoerck, found out the maker of the " Melissa" Virus in March, 1999. He went to the aid of the FBI again on May 7 , findingout the suspected sender of the dangerous" I LOVE YOU" virus. The suspect was caught in Manila on May 8.    

    Jonathan's special skills are in hot demand as officials around the world express alarm at the" virtual"

crime. In studying for finalexams, hanging out with his friends and refereeing his younger brother's football matches, the quiet, gentle teenager also gives les-sons on e-security(电子安全) to large companies. He

reads a lot and exchanges information with other computer experts to know much about the latest tricks of the hacker trade.      

    Many companies have already tried to employ him, but he is not interested at the moment. Instead, he

plans to begin law school in the autumn at Sweden's Uppsala University and start up his owne-security

company.      

    Ahhough he works with the FBI now and then, his family insists he's just" a regular kid". "Jonathan is a

great kid. He has his friends and he does a lot more than just play with the Computer,"his little sister Tessa said, adding that he helps the FBI because" he likes to help" not because he's looking for fame or

recognition.      

    When the world was hit by the" Love Bug" virus, Jonathan was too busy preparing a speech on security to look into the problem. "Finally on May 7 , I had some free time, so I began looking. "Within a few

hours, he found the suspect and e-mailed his methods and resuits to the FBI. He said his work on the

" Melissa" virus, which took three weeks to solve, was a big help in finding the suspect so quickly.     

     "This time I knew exactly where to start, what to disregard and what to look at. "

1. The underlined word" cybercriminals" in the first paragraph most probably means __   .

A. persons who commit a crime in the network    

B. softwares for smoothing away the poison    

C. persons who create the network    

D. designers for the Internet systems

2. The public started to know something about Jonathan just from_______.    

A. his helping the FBI to find out the sender of the dangerous" I LOVE YOU" virus    

B. his work together with Fredrik Bjoerck to find out the maker of the" Melissa" virus    

C. his little sister's talk about his good qualities as a regular kid and good programmer    

D. his speech on e-security to many computer companies after his fight against hackers

3. What do we know about Jonathan? 

A. He is a good fame hunter with various abilities.    

B. He is such a brave fighter that any criminal will feel afraid.    

C. He is an expert on e-security, not interested in running a company.    

D. He is a regular kid but does something unusual.

4. The passage mainly wants to tell us that _       .    

A. a Swedish kid helps the FBI find out the most wanted cyber criminals    

B. Jonathan is really a quiet, gentle and ordinary boy    

C. many companies want the young computer expert to join them    

D. all cybercriminals will surely be found out wherever they are

单项选择题