Choose the number of the sentence that expresses the main idea in each selection. Then click “GO.”
2. (1) The American ideal of a lush green lawn is borrowed from England,
where the cool, misty climate makes it easy to grow grass. (2) In America,
however, lawns are an energy-intensive, wasteful, and nonproductive form of
landscaping. (3) To begin with, achieving a picture-perfect lawn requires
gallons of expensive fertilizer and hazardous pesticides that pollute
groundwater and run off into lakes and rivers. (4) In addition, lawn owners
often exterminate the insects, moles, and gophers that play a part in the
balance of nature. (5) Equally destructive is the constant watering lawns
require, often where water is a limited resource. (6) Finally, the lawn must be
mowed on a regular basis to give it that green carpet effect, requiring
endless output of human and mechanical energy. (7) After all the labor and
expense, the final result is a flat carpet that lacks interesting features, wildlife,
or edible produce.