阅读下列短文，从每题所给的四个选项A、B、C和D中，选出最佳选项，并在答题卡上将该项涂黑。
A
When I was a child, I often dreamed of the time when I could leave home and escape to the city. We lived on a farm. In the winter especially, we were quite far away from the outside world. As soon as I left school, I packed my bags and moved to the capital. However, I soon discovered that my life has its problems too.
One big disadvantage is money. It costs so much to go out, not to mention basics like food and housing. Another disadvantage is pollution. I suffer from asthma (哮喘), and the air is so serious polluted that
