◎ 题干
Traveling around big cities by taxi can cost a lot of money, but it's usually        to take the underground train to most places.
A.amazingB.expensiveC.convenientD.exciting
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Traveling around big cities by taxi can cost a lot of money, but it's usually to take the underground train to most places.A.amazingB.expensiveC.convenientD.ex…”主要考查了你对  【形容词的比较级,形容词的最高级】【时间副词】【地点副词】【副词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。