阅读下列文章,在空白处填上合适词汇的选项。 A.trains B.by C.on D.to E.leading Philadelphia is a famous city in America. It lies 1 the west of the Delaware River. 1.6 million people live in the city. You can easily get to Philadelphia 2 different forms of transport. If you drive into Philadelphia, you can take the freeway 3 into Philadelphia from the east and the west.The airport handles a large number of flights every day. Between the airport and the city centre is a fast railway. The journey takes about 25 minutes and 4 leave every half hour. Taxis coat from 20 to 25 dollars to the city centre and travel time is about 20 to 30 minutes. If the weather is fine Philadelphia is a good place in which to get around 5 foot.