Điền vào chỗ trống
----- Nội dung dịch tự động từ ảnh -----
Air (1) is caused of ill health in human
beings. In a lot of countries, there are laws
limiting the (2) of smoke factories can
produce although there is not enough
information on the effects of smoke on the
atmosphere. Doctors have (3) that air
pollution causes lung diseases. The gases from
the (4) of cars have also increased air
pollution in most cities. The lead of petrol
produces a poisonous gas, which is often
collected in busy streets (5)____ by high
huildinar
exhausts circled
amount
pollution
put
proved