1. There is ___ acid in ordinary rain.
a) always
b) no ««
c) strong
2. Acid rain ____
a) appeared in the 20th century
b) has always existed in nature
c) is the result of industrial development ««
3. ____ is the cause of acid rain.
a) burning coal and oil ««
b) the wind
c) water in the air
4.A lot of trees have died in Canada because____
a) ecological laws of the country
b) of the power stations and factories ««
c) animals cannot live in polluted environment
5.Acid rain badly influences_____
a) only our fauna
b) only our flora
c) our habitats ««
6.People_____clean the smoke from factories and power stations.
a) are able to
b) do not know how to
c) should invent methods to.
««