有一个学生关系，其关键字为“学号”，又有一个课程关系，其关键字为“课程号”；另有一个
题型：填空题
问题：
有一个学生关系，其关键字为“学号”，又有一个课程关系，其关键字为“课程号”；另有一个选修关系，其关键字为“学号”和“课程号”的组合，则“学号”和“课程号”分别为该关系的______。
题型：填空题
From March 12 to 17 of each year, hundreds of clowns(小丑)get together in the Bognor Regis town, UK. They all wear tall blue hats and big red noses with colourful faces. The first International Clown Festival was in 1987, UK. All the clowns from all over the world came together to celebrate the great festival in England.
During the festival, people can see clowns from the world. They are together for the world of clown shows. They try their best to please all the people for the festival. In the shows, they have big feet, funny noses and look really funny. They sing and dance in a strange way to make people laugh. All people for the festival can have great fun. Of course, children like this interesting festival best.
Now women can take part in the clown shows , and they are very popular. But in the old days, only men could be clowns.
There are different kinds of clowns like white faces, red faces, street clowns and clowns for children. All these clowns are popular with people.
小题1:All the clowns get together __________ for the International Clown Festival.
A．in London
B．in a small town，UK
C．all over the world
D．around the whole Europe小题2:The first International Clown Festival was _____________.
A．in 1987
B．in the UK
C．both A and B
D．in London小题3:The festival lasts __________________.
A．a month
B．six days
C．seven days
D．five weeks小题4:Which of the following is NOT true?
A．The clowns wear in a funny way.
B．The clowns dance in a strange way
C．The clowns try their best to make others laugh
D．Women clowns are not popular with people.小题5:Which is the best title of the article?
A．The International Clown Festival
B．Men clowns and women clowns
C．Different kinds of strange festival
D．Different kinds of clowns in the festival