1. Can you really be best friends with someone of the opposite sex without ulterior motives?2. It is normal to be attracted to people of the opposite sex.
 the opposite sex the opposite gender
異性(一人) = someone of the opposite sex異性(多人) = people of the opposite sex
My sister is bad-tempered and would sap at anybody whenever she feels like it.下一題 - 保鑣 f我要發問