题目

The iPhone, the iPad, each of Apple’s products sounds cool and has become a fashion. Apple has cleverly taken advantage of the power of the letter “i” — and many other brands are following suit. The BBC’s iPlayer — which allows Web users to watch TV programs on the Internet — adopted the title in 2008. A lovely bear — popular in the US and UK — that plays music and video is called “iTeddy”. A slimmed-down version of London’s Independent newspaper was launched last week under the name “i”. In general, single-letter prefixes have been popular since the 1990s, whe大气中的臭氧层可吸收紫外线，对地球起保护作用，含有较多的臭氧(O3)．有关臭氧的下列说法中，不正确的是A.臭氧是单质B.每个臭氧分子由3个氧原子构成C.臭氧中含有氧元素D.臭氧与氧气组成纯净物