Some species, most of them insects, benefit increasingly from human activity. Modern, large-scale agriculture offers them a paradise. Crops are grown year after year in the same or nearby fields, helping insect populations to build up. Many of the worst pests are invaders from foreign countries that have left their natural enemies behind and are thus free from the checks of nature's balance. Agricultural scientists try hard to find ways to control these insect pests using cultivation techniques. They also import the ancient enemies of the invading insects and foster their resident enemies.According to the passage, some species that benefit from human activities:

have large populations because of modern agriculture.

are killed by modern techniques.

are generally killing all other living organisms.

have been used as a check of nature.

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Some species, most of them insects, benefit increasingl... | English MCQ #54 | Examora | Examora