3．A　解析：推理判断题。根据第六段可知，举警报器例子的目的是为了更形象地说明为什么会产生手机震动幻觉的原因。故A项正确。

　　4．B　解析：细节理解题。根据最后一段可知，作者认为，如果感觉手机震动就查看一下，毕竟这不是什么麻烦的事。故B项正确。

　　B

　　(2016·沈阳高三模拟)As we know，there are differences between western culture and Chinese culture.We can see differences when we pay attention to the way words are used.Let's look at the words about animals and plants.Most expressions in Chinese about the dog，for example，“a homeless dog”，“a mad dog”，“a running dog” and “a dog catching a mouse”，have negative meanings.But in western countries，dogs are thought to be honest and good friends of humans.In English，people use the dog to describe positive actions.For example，“you are a lucky dog” means you are a lucky person.And “every dog has its day” means each person has good luck sometimes.To describe a person's serious illness，they say “sick as a dog”．The word “dog­tired” means very tired.However，Chinese love cats very much.But in western culture，“cat” is often used to describe a woman who is cruel.There are many other examples of how “cat” is used differently as well.

　　The rose is regarded as a symbol of love in both China and some western countries.People think the rose stands for love，peace，courage and friendship.And the rose is the national flower of England，America and many other countries.

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