A) liable C) illegal
B) invalid D) guilty

A．are an instance of violating civil fights
B．are an official institution of sex discrimination
C．may seriously defy Women's Law of the country
D．may be a new start of sex discrimination in the country

A．It is a law that bans single-sex schools.
B．It sets a limit to single-sex classes in schools.
C．It conforms to the No Child Left Behind Law.
D．It requires a compelling reason of a district to create single-sex schools.