Question

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．amazing

B．expensive

C．convenient

D．exciting

Answer 1

C

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。