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问题 单项选择题

互联网上经常使用Java、JavaApplet、ActiveX编写的脚本，它们可能会获取用户的用户标识、IP地址和口令等信息，影响系统的（ ）。

A．安全

B．稳定

C．硬件

D．网络

答案

参考答案：A

填空题

Today’s lecture is about the mass (1) of the world’s population. There are two major (2) why people are moving to cities. The first reason is (3) . People are moving to the cities because that’s where they can find (4) and earn money. The second reason for the move to cities has to do with (5) of life issues: comfort and (6) . Cities often offer better (7) . And then for many, city life is just more (8) . An interesting consequence of urbanization is that the average (9) of people in the countryside is increasing, while that of the cities is (10) .
Three key (11) can be identified in our cities. First of all, they’re getting bigger. Most cities are bigger now than ever before. Cities are also changing shape. They’re getting (12) , because land is getting more and more expensive. (13) have become a symbol of modern cities.
Cities are also changing shape in other ways. The (14) Model and the (15) Nuclei Model are probably more typical of the cities we know today. They show the urban (16) that’s occurring in contemporary cities.
The third change is that our cities are breaking up into (17) communities, often by (18) group or (19) level. This often means that people stay within their community and do not come into contact with others from different (20) .
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单项选择题

甲公司位于H省B市，乙公司位于W省S市。2011年4月1日，甲公司向乙公司发出要约，要约中写明：甲公司向乙公司购买3000台光华牌照相机，每台照相机200元，交货地点在H省B市的丙仓库，交货时间是2011年5月1日；如接受上述条件，请于4月15日前回复。要约于4月2日到达乙公司信箱。乙公司收件员于4月3日从信箱中收取信件。乙公司高层研究后，于2011年4月12日向甲公司回复，内容为：我公司全部接受你方条件，但需要签订书面合同。信件于2011年4月13日到达甲公司信箱。甲公司领导在4月14日看见此书信。后双方董事长于4月18日在E省Q市签订了合同。

要约生效的时间为：( )。

A．4月1日

B．4月2日

C．4月3日

D．4月4日
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