问题
完形填空
解析下面的句子
17. Trains are fast and convenient , but rush hours can be terrible.
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18. Tricycles are worth using if you want to explore the narrow alleys of old Beijing .
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答案
17 It is fast and convenient to take the trains, but it can be terrible taking the train during rush hours.
18 If you want to look around in the narrow alleys of Beijing , it is a good idea to use a tricycle.