问题
选择题
下列反应不属于置换反应的是（ ）
A．一氧化碳与氧化铁在高温下反应生成了铁和二氧化碳
B．木炭与氧化铜混合加热得到金属铜和二氧化碳
C．活泼金属与酸反应生成盐和氢气
D．活泼金属与盐溶液反应生成另一种金属和另一种盐
答案
答案：A
搜题请搜索小程序“爱下问搜题”
下列反应不属于置换反应的是（ ）
A．一氧化碳与氧化铁在高温下反应生成了铁和二氧化碳
B．木炭与氧化铜混合加热得到金属铜和二氧化碳
C．活泼金属与酸反应生成盐和氢气
D．活泼金属与盐溶液反应生成另一种金属和另一种盐
答案：A
The more accessible a company’s services are, the more business it will do. Why are the same ___1___ not applied when it comes to Internet websites then? A Hong Kong study has found that the local sites of two leading ___2___, McDonald’s and Motorola, are the most user-unfriendly of the 30 websites tested. The lack of ___3___ means they are not only losing customers, but ___4___ to meet their social responsibilities. In an ever-more Internet-connected world, ___5___ are as important as physical shops or offices. They are ___6___ used as a way of banking, shopping and getting news. This is especially so for the disabled, who find it ___7___ to shop on-line than go to a store in person. A website that does not let them do this is the same as having a(n) "___8___" sign on a door. In Hong Kong, it is ___9___ not to provide the disabled with access to schools and buildings, but at present there are no specific laws on Internet accessibility. However, companies are morally responsible for ensuring that their websites can be ___10___ by people who are visually disabled or have difficulty walking around. Ideals for design have long been put forward by the World Wide Web Consortium, a global community working on open standards to ___11___ accessibility and development. Computer technology is ___12___ fast and it is now much easier to create websites that are ___13___ for all people, sighted or disabled. Companies should ensure that the designers of their websites ___14___ guidelines for accessibility. We should try to make our city as ___15___ as possible, on-line and off.
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