Science and mathematics are compulsory courses from one to five (the order in school may be different, and our school doesn't know how to follow the order of 14523). Elective courses 2- 1, 2-2, 2-3, 4-2, 4-4 (different schools and regions may be different). Choose one from the four series of * * (that is, choose two additional questions in the college entrance examination as part)