[填空题]

[听力原文]11-15
Americans depend on their cars more than any other people. The family car has been a common thing since the early twentieth century and it has changed Americans’ life. Many people have moved outside the large cities to the suburbs. Some Americans spend two hours a day or more in their cars going to work and back home. Cars have become the means of transportation for most Americans when they go shopping and even go on vacations.
In the past Americans liked big cars and the gas wasn’t expensive. However. the price of gas has greatly increased in recent years. Smaller cars and foreign cars have become very common. That’s why Japanese and German cars sell well in the U. S.

What does the speaker mainly talk about
（）in the U. S.