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閱讀下面短文，從每小題A、B、C三個選項中，選出一個能填入文中相應空白處的最佳答案。

We 　　1　　 a survey about different 　　2　　 transportation last week．We asked students 　　3　　 their favorite kinds of transportation．　　4　　 are some of the results．Most students come to school 　　5　　bike and they like 　　6　　 bikes．Of course, bikes are 　　7　　 than cars and buses．Some students like cars 　　8　　 they are safer than bikes．Cars are also faster than bikes and buses．Among some students, buses are not popular, because they often have 　　9　　 passengers(旅客)．Buses are also dirtier and more crowded．However(然而), 　　10　　 many people can afford(買得起)a car．

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