搜题请搜索小程序“爱下问搜题”
问题 单项选择题

下列叙述中正确的是_______。

A．电子商务中数据的完整性指在因特网中传送的信息不被第三方监视和窃取

B．数据传输的安全性指因特网中传送的信息不被篡改

C．身份认证用来确认对方的正式身份

D．以上都不对

答案

参考答案：C

问答题

某校准备进行一次综合实践活动的汇报展览。主题是：今天你“低碳”了吗？

【活动背景】哥本哈根世界气候大会，被冠以“有史以来最重要的会议”、“改变地球命运的会议”等各种重量级头衔。这次会议让很多人对人类当前的生产和生活方式开始了深刻的反思：追求健康生活，不仅要“低脂”、“低盐”、“低糖”，也要“低碳”！低碳生活是指生活作息时所耗用的能量要尽力减少，从而减低二氧化碳的排放量。

【成果展示】成果展示分为三大板块。

（1）第一板块：引领潮流的名词：“低碳”。请用简洁的语言介绍什么是“低碳”。

_________________________________________________________

（2）第二板块：人类的悲剧：大自然的报复。请描述一个人类遭受自然界无情报复的画面。

_________________________________________________________（3）第三板块：冷静而理智的行动：“低碳生活”。请写出两个“低碳生活”的良好生活习惯。

_________________________________________________________

查看答案
单项选择题

Passage Two


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.

The author uses figures in Paragraph 2 to show

A．the tendency of cutting household waste

B．the increase of packaging recycling

C．the rapid growth of supermarkets

D．the fact of packaging overuse
查看答案