다음 글의 요지로 가장 적절한 것은?
Dr. Roossinck and her colleagues found by chance that a virus increased resistance to drought on a plant that is widely used in botanical experiments. Their further experiments with a related virus showed that was true of 15 other plant species, too. Dr. Roossinck is now doing experiments to study another type of virus that increases heat tolerance in a range of plants. She hopes to extend her research to have a deeper understanding of the advantages that different sorts of viruses give to their hosts. That would help to support a view which is held by an increasing number of biologists, that many creatures rely on symbiosis, rather than being self-sufficient.
- ①Viruses demonstrate self-sufficiency of biological beings.
- ②Biologists should do everything to keep plants virus-free.
- ③The principle of symbiosis cannot be applied to infected plants.
- ④Viruses sometimes do their hosts good, rather than harming them.
정답 ④
출처: 인사혁신처 공개 기출(공공데이터포털, 이용허락 제한 없음)