鼻疾应选（）。

years

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若有关系R (A，B，C，D)和S(C，D，E)，则与表达式π_3,4,7(σ_4＜5(R×S))等价的SQL语句如下：

SELECT (3) FROM (4) WHERE (5) ;

 

根据下面一段对话内容，从方框内的7个选项中选出最佳选项。 A: Excuse me. ____16____ B: Yes. You don’t know me, of course. I don’t teach here. I just give oral examinations here now and then. Don’t be nervous. A: Nervous Who Me B: ____17____ I’m going to ask you a few questions. Then we are going to have a short conversation in English. Do you understand A: Yes, of course I do. ____18____ B: After the examination, please. First of all. why are you learning English A: Why am I learning English B: Yes, I mean, what are you going to do with it Are you going to be a teacher of English, or what else A: ____19____ I really must ask you something first. B: Very well. If you insist, go ahead please! A: Would you like a cup of coffee B: PardonWhat did you say A: You see, I’m English. I’m one of the teachers here. I came to ask you if you would like a cup of coffee. B: ____20____ . And thank you so much!

now

and

all

so

若有关系R (A，B，C，D)和S(C，D，E)，则与表达式π_3,4,7(σ_4＜5(R×S))等价的SQL语句如下：

SELECT (3) FROM (4) WHERE (5) ;

 

a

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Michael Greenberg is a very popular New Yorker. He is not famous in sports or the arts, But people in the streets 16 him, especially those who are 17 . For those people, he is "Gloves" Greenberg. How did he get that 18 He looks like any other businessman, wearing a suit and carrying a briefcase (公文箱). But he’s 19 . His briefcase always has some gloves。 In winter, Mr.Greenberg does not 20 like other New Yorkers, who look at the sidewalk and 21 the street. He looks around at 22 .He stops when he 23 someone with no gloves. He gives them a pair and then he 24 ,looking for more people with cold 25 . On winter days, Mr.Greenberg 26 gloves. During the rest of the year, he 27 gloves. People who have heard about him 28 him gloves, and he has many in his apartment. Mr. Greenberg 29 doing this 21 years ago. Now, many poor New Yorkers know him and____30____his behavior. But people who don’t know him are sometimes 31 him. They don’t realize that he just wants to make them 32 . It runs in the 33 .Michael’s father always helped the poor as he believed it made everyone happier. Michael Greenberg feels the 34 .A pair of gloves may be a 35 thing, but it can make a big difference in winter.