A．They become lighter when the temperature is low.
B．Their chemical composition changes with the temperature.
C．Their color darkens when the temperature is high.
D．Their structures are rearranged as the temperature fluctuates.

A．It guarantees federal investment in schools.
B．It is a universal law that applies to every university
C．It stops gender discrhnination in many schools.
D．It helps to save federal money on education programs.

A．Title Nine makes girls join in sports programs.
B．Title Nine has a very good effect on sports.
C．Title Nine is very effective in high schools.
D．Title Nine is well obeyed by high schools.