Karma İngilizce Soruları 3 47. Soru

47.

Aphids are tiny green insects that are a chronic pest for farmers. Spiders and ground beetles living along field margins can keep their numbers under control. But as fields have become larger, the spiders and beetles take longer to get to the middle of them, so farmers began using pesticides for a problem that was once controlled naturally. An insect ecologist came up with a new solution called "beetle banks". These are one metre-wide strips of grass planted at 100-metre intervals across the fields. After two years, there will be enough beetles and spiders in one beetle bank to eat 52 million aphids a week, and the farmer will get rid of aphids without using a single drop of pesticide.

We can infer from the passage that………. .