问题
单项选择题
信息的（）属性体现了一条信息对有些人是有价值的，而对其他人可能是无用的。
A．时效性
B．针对性
C．等级性
D．反馈性
答案
参考答案：B
解析：
信息的针对性体现了一条信息对有些人是有价值的，而对其他人可能是无用的。
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信息的（）属性体现了一条信息对有些人是有价值的，而对其他人可能是无用的。
A．时效性
B．针对性
C．等级性
D．反馈性
参考答案：B
解析：
信息的针对性体现了一条信息对有些人是有价值的，而对其他人可能是无用的。
| 方框填词 | |
Man has been polluting the earth. The more people, the 4 pollution. Many years ago, the problem was not so 5 before because there were not so many people. When the land was used up or the river was dirty in a place, men moved to 6 place. But this is no longer possible. Water pollution kills our fish and pollutes our drinking water. Noise pollution makes us talk 7 and become angry 8 . Air pollution is still the most serious. It's bad to all living things in the world. The pollution SO2 is now 9 problem of air pollution. It is caused by heavy traffic. It is sure that if there are 10 people driving, there will be less air pollution. |