LC: top10% get $1000, volunteers inclined to run slower in 500 VS 50 --> extreme effort would not be worthwhile in the 500-competitor race (explanation)
justify the explanation: 需要和说的原因沾边: 只有D
Improvements in the quality of the advertising materials used in mail that is carefully targeted to individuals can improve the response rate for such mail. 重点在quality而不是target 跑题。
d错
LC: top10% get $1000, volunteers inclined to run slower in 500 VS 50 --> extreme effort would not be worthwhile in the 500-competitor race (explanation)
justify the explanation: 需要和说的原因沾边: 只有D