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问题 填空题

由于铁的化学性质比较活泼，所以地壳中的铁都以______的形式存在．在这些铁的化合物中，常用来炼铁的有______，______和______等．它们的主要成分分别是______和____________．

答案

铁的化学性质较活泼，在地壳中常以化合物的形式存在，主要矿物有

赤铁矿；黄铁矿；磁铁矿（或菱铁矿）；化学式分别为Fe2O3；FeS2；Fe3O4；（或FeCO3）．

故答案为：化合物；赤铁矿；黄铁矿；磁铁矿（或菱铁矿）；Fe2O3；FeS2；Fe3O4；（或FeCO3）．

单项选择题

若计息周期为季，利率为2%，则年名义利率为( )。

A．8%
B．8.24%
C．12%
D．12.24%
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单项选择题

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to (17) fraudulent Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".
In phishing, the perpetrator sends out legitimate- (18) looking e-malls, appearing to come from some of the Web’s most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be (19) victimized because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected (20) bookmark entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing. (21) habits,

A. connecting B. binding C. looking D. contenttagging
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