The ________ from the forest fire could be seen ten miles away.

A.in which

B.at which

C.in that

D.from which

A.f is a binary relationship from X to Y, but not a function from X to Y;

B.f is a function from X to Y, but it is not a full shot, nor is it a single shot;

C.f is a full shot from X to Y, but not a single shot;

D.f is a double shot from X to Y.

A.import turtle as t

B.from turtle import*

C.import turtle

D.import setup from turtle

E.from turtle

F.from turtle as t

A.confus

B...with

C.result...from

D.shar

E...with

F.F.keep ...from

A.T

B.F

C.NM

A.import turtle as t

B.from turtle import*

C.import turtle

D.import setup from turtle

E.from turtle

F.from turtle as t

A.A.put on

B.B.put down

C.C.put back

D.D.put off

His health______, my father retired from the business last year.

A. fails

B. was failed

C. failing

D. failed

对于教学数据库的三个基本表：S(Sno，Sname，Ssex)，SC(Sno，Cno，Grade)，C(Cno，Cname， Teacher)，其中S为学生表，SC为学生选课表，C为课程表，则对于语句：检索至少选修LIU老师所授课课程中一门课程的女生姓名，SQL语句错误的是______。

A．SELECT Sname FROM S，SC，C WHERE S.Sno=SC.Sno AND SC.Cno=C.Cno AND Teacher=‘LIU’AND Ssex=‘F’

B．SELECT Sname FROM S WHERE Ssex=‘F’AND Sno IN (SELECT Sno FROM SC WHERE Cno IN(SELECT Cno FROM C WHERE Teacher=‘LIU’))

C．SELECT Sname FROM S WHERE Ssex=‘F’AND EXISTS (SELECT* FROM SC WHERE SC.Sno=S.Sno AND EXISTS (SELECT*

D．SELECT Sname FROM S WHERE Ssex=‘F’AND EXISTS(SELECT* FROM SC WHERE SC.Sno=S.Sno AND EXISTS (SELECT*

A.A.by then

B.B.by that time

C.C.by what time

D.D.by which time