5. What is the passage above mainly about?
A. Conservation conflicts B. Agricultural irrigation
C. The headwaters of a major river D. Natural-resource shortages
Passage 3: Read the following passage and choose the correct word for each of the blanks.
A person who tosses a can or a napkin on the ground is contributing to land pollution. This
(1)______ of pollution mainly involves the depositing on land of solid wastes that cannot be broken
down quickly or, in some cases, at all. Heaps of trash are not only unpleasant to look at - they can
(2)______ interfere with the lives of plants and animals.
Land pollution also includes the build-up of (3)______ chemicals on land. The use of
pesticides in farming is a major source of this type of pollution. These chemicals are spread over
fields to kill insects, weeds, fungi, or rodents that are a threat to crops. But pesticides harm or
(5)______ other living things too. When they drift with the wind or become absorbed (4)______
fruits and vegetables, they can become a source of health problems such as cancer and birth defects.
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