4.A　细节理解题。由倒数第二段最后两句“It is actually...you have not paid your entire bill,so watch out!”可知,在美国不可不付小费。故A项正确。

　　二、语法填空(共10小题;每小题1.5分,满分15分)

　　Body and food

　　Our body,which has close relations with the food that we eat 1. our daily life,is the most important thing that we own,so our body 2.(need) proper treatment and proper nourishment(营养). 

　　The old saying “An apple a day keeps the doctor away” is not as silly as some people think.The body needs fruit 3. vegetables,such as apples,pears,bananas,carrots and cabbages,because they contain vitamin C,4. is very necessary and important to us all.It’s clear that a lack of vitamin C can make people ill and weak easily. 

　　In order to get enough needed vitamins,many people take extra vitamins in pill form,5.(believe) that these will make them 6.(health).But a good diet is made up of nourishing food and this gives all the vitamins that we need.The body doesn’t need or use extra vitamins,so why waste money on them? 

　　Nowadays many people are too busy to bother about eating properly.They throw anything into their 7.(stomach),eating something carelessly and 8.(hurried).The list of illnesses 9.(cause)or made worse by bad eating habits is frightening.It is high time we should realize the importance of having a good diet.If not,it is impossible for 10.(we) to keep fit and strong. 

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