16. Which of the following titles best suits this passage?
(A) Understanding More about the Lost Cities
(B) Why Some Cities Lost Their Residents
(C) How to Build Safer Homes in Desert
(D) Why Some Cities Failed to Last Longer
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統計: A(200), B(21), C(15), D(20), E(0) #3343161
統計: A(200), B(21), C(15), D(20), E(0) #3343161