填空题

In many cities of the developing countries, buses are occasionally so crowded that it is quite ______ to see buses running around with passenger hanging to their doors and windows.

【参考答案】

common

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填空题

In almost all of the major Western European cities private car transport accounts for between 70 and ______ percent of passenger-kilometers.

填空题

The table shows that the ______ number of trips each person in Beijing takes by public transport is 107.