问题
选择题
若定义在R上的函数f（x）满足：对任意x1，x2∈R有f（x1+x2）=f（x1）+f（x2）+1，则下列说法一定正确的是[ ]
A.f（x）为奇函数
B.f（x）为偶函数
C.f（x）+1为奇函数
D.f（x）+1为偶函数
答案
答案：C
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若定义在R上的函数f（x）满足：对任意x1，x2∈R有f（x1+x2）=f（x1）+f（x2）+1，则下列说法一定正确的是[ ]
A.f（x）为奇函数
B.f（x）为偶函数
C.f（x）+1为奇函数
D.f（x）+1为偶函数
答案：C
People often say that the Englishman’s home is his castle. In this sense they mean that the home is very important and 21 . Most people in Britain live in houses 22 flats, and many people own their homes. This means that they can make them individual(个人的); they can 23 them and change them in any way they 24 . In a crowded city the individual knows that he or she has a private space which is 25 for himself or herself and for invited friends. People usually like to 26 their space. Are you sitting now in your home or in a beach or a train? If you are on the beach you may have spread your 27 around you; on the train you may have 28 your coat or small bag on the seat beside you; in a library you may have one corner or chair which is your own. Once I was traveling on a 29 to London. I was in a section for four people and there was a table between us. The man on the opposite side to me had his briefcase on the table. There was no 30 on my side of the table at all. I was made rather 31 . I thought he thought that he owned the 32 table. I took various papers out of my bag and put them on 33 ! When I did this he stiffened and his eyes nearly popped out of his head. I had 34 his space ! A few minutes later I took my papers off his case in order to read them. He 35 moved his case to his side of the table. ( Of course , it is possible that he just wanted to be helpful to me !
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