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对于长度为n的顺序表，插入或删除表中元素的时间复杂度为【】；对于顺序栈或队列，插入或删除表中元素的时间复杂度为【】。

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世纪之交，中央做出了实施西部大开发的战略决策。试述中央在此时提出实施这一战略的依据，以及实施这一战略对经济、社会发展的重大意义。你认为在实施这一战略过程中，应该处理好哪些关系？

The plants would be insect resistant as a gene from the soil bacterium could direct cells

Recently more and more attention has been focused to S1.
the problem of preserving the environment. The fact that a
Government Ministry being called the Department of the S2.
Environment has been created shows how unimportant the S3.
issue is considered to be.
Over the past thirty years or so the quality of many
people's lives have deteriorated in some respects because of S4.
technological progress. Those people living near airports are
constantly attacked by the noise of increasingly larger and
more powerful jet aircraft taken off and landing. The motor S5.
car has been responsible for many changes in the
environment. On the one hand it has brought mobility to
millions of people, but on the other it has taken rise to the S6.
construction of more noisy roads and has polluted the
atmosphere with exhaust fumes. While towns and cities have
become larger and uglier and more dense populated the S7.
rural areas have lost most of their population owing to the
need for less workers in agriculture. The countryside has S8.
also been affected by the large scale use of insecticides.
For one thing the killing of insects has resulted from a loss S9.
of balance in the ecology. Many people are afraid that fruit
and vegetables sprayed with chemicals may have some
poisonous effect on the people who eat it. S10.
【S1】

在实际的网络运行环境中，数据备份与恢复功能是非常重要的。一个实用的局域网应用系统设计中必须有网络数据备份，恢复手段和灾难恢复计划。请根据你对网络数据备份、恢复方面知识的了解，讨论以下几个问题：
1．如果需要你去完成一个网络备份系统的设计，你会考虑解决哪四个主要的问题？
2．备份网络文件就是将所需要的文件拷贝到光盘、磁带或磁盘符等存储介质上。对于重要的网络信息系统的软件与重要数据，有人提出需要有多个副本，并且其中一个副本需要异地存放，你觉得必要吗？为什么？
3．如果要你去审查一个网络备份系统的实际效果，你会重点考察的两个主要问题是什么？