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III. Fill in each numbered blank with ONE suitable word. Write your answers on the answer sheet, (1.0
point)
There are many sources of pollution in our modern world. At present, (1)______ most severe sources
are acid rain, car exhaust fumes and oil spills. Factory chimneys give (2)
smoke that contains sulfur
dioxide and nitrogen oxide. These gases combine with the moisture in the atmosphere to form sulfuric acid
and nitric acid. When it rains, these acids
in the rain and turn it acidic. Acid rain is thought to be
problem of all. It has polluted aquatic life by turning many lakes into lifeless bodies of
water. In these areas, there is no limestone in the rocks to neutralize the acid rain (5)_____. One remedy is
to pump limestone into the acidic lakes. (6) it is not possible to do this on a large enough scale to
the worst
save all the lakes. Car exhaust fumes contain carbon monoxide and lead which are highly poisonous. In big
cities, the exhaust fumes build up and pose a health hazard
human beings. Pollution of the sea by
oil threatens
(8) life. Much of the oil comes from ships that clean their fuel tanks while at sea.
Offshore oil wells also discharge vast
of oil into the sea. Pollution of the sea can also be caused
by oil spills. An oil spill may occur as a
(10)
of accidents involving oil tankers.
PART D WDITIN