3．D　解析：细节理解题。根据第五段的“apart from computers, Windows 8 will be used on all devices, including smartphones, tablet PC's and so on.”可知，Windows 8除了电脑之外，还可以在所有的设备上使用，因此选择D项。

　　4．D　解析：细节理解题。根据文章最后一段的“Also, many users have had a problem to get used to the new interface(界面) introduced by Windows 8.”可知，Windows 8的使用者面对的一个问题就是他们不习惯新界面。故选D项。

　　B

　　(2016·西安中学月考)The term “smog” was first used in London during the early 1900's to describe the combination of smoke and fog.What we typically call “smog” today is a mixture of pollutants but is primarily made up of ground ­ level ozone (臭氧)．

　　Ozone can be beneficial or harmful depending on where it stays.The ozone staying high above the Earth protects human health and the environment, but ground­level ozone is responsible for the choking, coughing, and painful eyes associated with smog.The ozone in smog also prevents plants growth and can cause widespread damage to crops and forest.

　　Major smog occurrences often are linked to heavy motor vehicle traffic, high temperatures, sunshine, and calm winds.Weather and geography affect the position and severity of smog.Because temperature regulates the length of time it takes for smog to form, smog can form faster and be more severe on a hot and sunny day.When warm air stays near the ground instead of rising and winds are calm, smog may stay trapped over your city for days.As traffic and other sources add more pollutants to the air, the smog gets worse.Smog is often more severe away from the pollution sources because the chemical reactions that cause smog occur in the atmosphere while the reacting chemicals are being moved by the wind.

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