A．Japanese students study much harder than Columbian students.B．Columbian students score higher than Japanese students in math.C．Columbian students are more optimistic about their math skills.D．Japanese students have better conditions for study.
A．Japanese students study much harder than Columbian students.
B．Columbian students score higher than Japanese students in math.
C．Columbian students are more optimistic about their math skills.
D．Japanese students have better conditions for study.