47. According to the passage, which of the following problems is NOT mentioned?
(A) Truth of the advertisement
(B) Class size
(C) Quality teaching
(D) The total number of camping program
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統計: A(3), B(9), C(3), D(6), E(0) #1216146
統計: A(3), B(9), C(3), D(6), E(0) #1216146