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问题 问答题

用微粒的观点说明：物体固、液、气三态的密度不同．

答案

物体在气态时间隔最大，体积也最大．在液态时间隔较大，体积也较大．在固态时间隔较小，体积也较小．物体在不同状态时的质量不变．根据物体的密度的求法可知，物体在气态时密度最小，在液态时密度较大，在固态时密度最大．

选择题

I'll never forget such a beautiful place _____ I spent my childhood there with my grandma. [ ]

A. that

B. although

C. where

D. because

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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 (1) fraudulent Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".

In phishing, the perpetrator sends out legitimate- (2) 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 (3) 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 (4) bookmark entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing. (5) habits,

1（）

A．few

B．fraudulent

C．normal

D．structured
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