A 3:
We are using up the world's petroleum. We use it in our cars and to heat our
building in winter. Famers use petrochemicals to (71)
use them to kill insects eating plants. These chemicals go (72)
the soil rich. They
rivers and
lakes and kill the fish there. Thousands of pollutants also go into the air and pollute
it. Winds carry this (73) air to other countries and other continent. Poor
formers use the same land over and (74) . The land needs a rest so it will
be better next year. However, the farmers must have food this year. Poor people
cut down forests (75) firewood. In some areas when the trees are gone,
7
the land becomes desert. Poor people can't save the environment for the future;
This is not a problem for one country or one area of the world. It is a problem for
all humans. The people and the nations of the world must work together to
preserve the world's resources.
71. A. enrich B. change C make D. let
72. A. to B. toward C. at D. into
73. A. pollute B. polluting C. polluted D. pollution
74. A. over B. again C. repeated D. repeating
75. A. of B. for C. with D. at
