听写训练 Test 7 The cars

（单词翻译）

 As big cars cause many problems, / such as pollution shortage¹ of parking² space, crowded traffic, / scientists are now trying to design some small cars that may some day replace today’s big automobiles³. / If more people begin to drive such cars in the future, / there will be less air pollution. / There will also be more space for parking cars in cities, / and the streets will be less crowded. / Three such cars can fit in the space / that is now needed for one car of the usual size. / The little cars will cost much less to own and to drive. / Driving will be safer as these cars can only go 60 kilometers per hour. /