j g r qi kan yu s c i
j p c l qi kan yu j m c a
j p c l qi kan yu j p c c
教与学 jiao yu xue qi kan
n a t u r e yu s c i e n c e qi kan
n c qi kan yu a m
n c qi kan yu l i g h t
n c yu c c r qi kan
n i qi kan yu s c i
o a qi kan yu s c i
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