题目内容
（请给出正确答案）
The main attraction of training mature elephants is ______.
A．early financial returns
B．their willingness to obey their trainers
C．the avoidance of anxiety in the elephant
D．that elephants are difficult to keep
答案
A
解析：文章第3段说对15～20岁之问的大象进行训练最为经济，因为它们已经能干重活，可以很快挣回饲养它们的成本。
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