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问题 单项选择题

关于Windows的描述中，错误的是______。

A．它是多任务操作系统

B．内核有分时器

C．可使用多种文件系统

D．不需要采用扩展内存技术

答案

参考答案：D

解析： Windows是多任务操作系统，允许多个程序同时进行。多任务操作系统采用分时机制，含有分时器，在激活的应用程序中分配处理器时间。Windows运行在保护模式下，内存管理复杂，当可寻址内存用完后，可使用扩展内存。文件系统是操作系统最重要的组成部分，负责管理设备中存储的文件。

单项选择题

Ask someone what they have done to help the environment recently and they will almost certainly mention recycling. Recycling in the home is very important of course. However, being forced to recycle often means we already have more material than we need. We are dealing with the results of that overconsumption in the greenest way possible, but it would be far better if we did not need to bring so much material home in the first place.
The total amount of packaging increased by 12% between 1999 and 2005. It now makes up a third of a typical household’s waste in the UK. In many supermarkets nowadays food items are packaged twice with plastic and cardboard.
Too much packaging is doing serious damage to the environment. The UK, for example, is running out of it for carrying this unnecessary waste. If such packaging is burnt, it gives off greenhouse gases which go on to cause the greenhouse effect. Recycling helps, but the process itself uses energy. The solution is not to produce such items in the first place. Food waste is a serious problem, too. Too many supermarkets encourage customers to buy more than they need. However, a few of them are coming round to the idea that this cannot continue, encouraging customers to reuse their plastic bags, for example.
But this is not just about supermarkets. It is about all of us. We have learned to associate packaging with quality. We have learned to think that something unpackaged is of poor quality. This is especially true of food. But it is also applied to a wide range of consumer products, which often have far more packaging than necessary.
There are signs of hope. As more Of us recycle, we are beginning to realize just how much unnecessary materials are collecting. We need to face the wastefulness of our consumer culture, but we have a mountain to climb.

What can we learn from the last paragraph

A. Fighting wastefulness is difficult.
B. Needless material is mostly recycled.
C. People like collecting recyclable waste.
D. The author is proud of their consumer culture.
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单项选择题

下面哪个参数项最可能导致GPRS通道不可靠而经常掉线（）

A.表地址

B.通讯速率

C.电表规约

D.心跳周期
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