建立一个学生信息表student，要求它由学号sno，姓名sname，性别sex，年龄age，4个属性组成，其学号属性惟一，学号、姓名字段不能为空。下列语句正确的是
A. CREATE TABLE student (sno char(5) NOT NULL sname char(8) NOT NULL sex char(1) age int)；
B. CREATE TABLE atudent (sno char(5) NOT NULL UNIQUE sname char(8) sexchar(1) age int)；
CREATE TABLE (sno char(5) NOT NULL UNIQUE sname char(8) NOT NULL sex char(1) age iht)；
D. CREATE TABLE student (sno char(5) NOT NULL UNIQUE shame char(8) NOT NULL sex char(1) age int)；
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A．They advised people what to see and where to go.B．They provided people with a lot of
A. They advised people what to see and where to go.
B. They provided people with a lot of entertainment.
C. People had chances to see the places where they'd like to go.
D. People were able to see other parts of the world they would never themselves be able to visit.
A．People could choose to watch what they want.B．People could be well informed staying
A. People could choose to watch what they want.
B. People could be well informed staying at home.
C. People could actually see the people and places talked about.
D. Television news came to people more quickly than radio news.
The Hopi language locates places only in connection with other spaces or directions.
A. Y
B. N
C. NG
A．In a travel agency.B．At the reception desk.C．In a doctors office.D．In a drugstore.
A. In a travel agency.
B. At the reception desk.
C. In a doctors office.
D. In a drugstore.
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