Traveling around big cities by taxi can cost a lot of money, but it's usually to take the underground train to most placesA.amazingB.expensiveC.convenientD.exciting
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C解析amazing令人惊异的； expensive昂贵的；convenient方便的； exciting令人兴奋的。句意：乘出租车在大城市旅行会花许多钱，但是这通常能方便的乘地铁到大部分地方。结合语境可知选C。考点：形容词辨析