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Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. According to the conversation, how did colonists try to make traveling in cities easier

A. By widening the streets.
By using coaches to provide free public transportation.
C. By preventing carts from entering town.
D. By making laws to keep farm animals off the street.

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[说明] 根据下面所给的AAA数据库，或者按照下列所给的每条SQL查询语句写出相应的功能，或者按照下列所给的每种功能写出相应的SQL查询语句。假设使用名称为AAA的数据库，它包括Students(学号char(8)，姓名varchar(8)，年龄 int，专业varchar(20)，入学日期Date Time)和Score(学号char(8)，课程名varchar(10)，成绩 numeric(5，2))两张表。 [问题3] 请说出该程序段的功能。 declare @e numeric(5,2) declare @ c1 int, @ c2 int, @ c3 int, @ c4 int set @ c1=0; set @ c2 =0; set @ c3=0; set @ c4=0 declare xxx cursor for select 成绩 from score open xxx fetch xxx into @ c while @’@ fetch_status = 0 begin if(@c ＞ =90) set @cl =@ e1 +1; else if( @ c ＞ =70) set @ c2 =@ c2 +1; else if(@ c＞ =60) set @ c3 =@ c3 +1; else set @ c4 = @ c4 + 1 fetch from xxx into @ c end close xxx deallocate xxx print 优秀生人数：’+sb(@ c1，5)； print食好生人数：’+str(@ c2，5)； print及格生人数：’+str(@ c3，5)； print及格生人数：’+sh(@ c4，5)

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[说明] 设有三个关系： BOOK (BNO，BNAME，PUBLISH_YEAR，PRICE，PRESS) READ(RNO，RNAME，DUTY) BR(BNO，RNO，RETURN_DAY) 试用关系代数表达式表示下列查询语句： [问题5] 检索借了书号为BOOKl这本书的读者号。

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Why does the speaker mention what is printed on certain T-shirts

A. To show how politics have changed over the years.
B. To point out that T-shirts often provide personal information.
C. To illustrate how the printing on clothing has improved.
D. To support that T-shirts are a form of art.

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[说明] 设有三个关系： BOOK (BNO，BNAME，PUBLISH_YEAR，PRICE，PRESS) READ(RNO，RNAME，DUTY) BR(BNO，RNO，RETURN_DAY) 试用关系代数表达式表示下列查询语句： [问题3] 检索在1988年以前出版的书名。

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Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. According to the conversation, how did colonists try to make traveling in cities easier

A. By widening the streets. By using coaches to provide free public transportation. C. By preventing carts from entering town. D. By making laws to keep farm animals off the street.

[说明] 设有三个关系： BOOK (BNO，BNAME，PUBLISH_YEAR，PRICE，PRESS) READ(RNO，RNAME，DUTY) BR(BNO，RNO，RETURN_DAY) 试用关系代数表达式表示下列查询语句： [问题5] 检索借了书号为BOOKl这本书的读者号。

Why does the speaker mention what is printed on certain T-shirts

[说明] 设有三个关系： BOOK (BNO，BNAME，PUBLISH_YEAR，PRICE，PRESS) READ(RNO，RNAME，DUTY) BR(BNO，RNO，RETURN_DAY) 试用关系代数表达式表示下列查询语句： [问题3] 检索在1988年以前出版的书名。

A. By widening the streets.
By using coaches to provide free public transportation.
C. By preventing carts from entering town.
D. By making laws to keep farm animals off the street.