题目：Whichofthefollowingidiomsbestsuggeststhespiritof"tough-mindedandindependentasakeyplayertoconfrontchallengesandconquerdifficulties"?
A、天府之国
B、中流砥柱
C、过门不入
标准答案：中流砥柱
题目：Which of the following idioms best suggests the spirit of "tough-minded and independent as a ke
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