24. What aspect of the Moscow Metro sets it apart from many other global metro systems?
(A) Its stations double as art galleries.
(B) It introduced the first interactive route-finding touchscreen.
(C) It was the first metro system to offer 24/7 service.
(D) It's the only metro system that operates underwater.
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24. 莫斯科地鐵的哪個方面使它與許多其...
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