Tham Gia Group Dành Cho 2K10 Chia Sẻ, Trao Đổi Tài Liệu Miễn Phí
4. a. Read the text about air pollution. Choose the
Air pollution is a big problem in big cities. Evidence shows that air pollution may cause ser
problems for humans and animals. We (1)
more health problems if we do not lower the
air pollution levels. There are some simple actions we c ...