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问题 单项选择题

哪种药物只引起精神依赖而不引起躯体依赖

A．酒精
B．氯丙嗪
C．巴比妥
D．尼古丁
E．眠尔通

答案

参考答案：D

解析：尼古丁的依赖性主要是精神依赖，即停止吸烟后产生精神、心理上的一种渴求。

选择题

关于气温的变化规律，叙述正确的是（　　）

A．北半球7月份，陆地气温低于同纬度海洋气温

B．山麓地带温度低于山顶温度

C．高度每上升1200米，气温下降7.2℃

D．同一地区，近地面下层空气较上层空气冷
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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 ______ Web sites without their knowledge or consent. Pharming has been called"phishing without a lure".
In phishing, the perpetrator sends out legitimate-______ e-mails, 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 ______ 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 flies 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 ______ entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing ______.

A．hypertext
B．computation
C．expectation
D．bookmark
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