54. Why does the writer refer to the new scientific research?
1. to state the impact linked to DDT and other pesticides
2. to illustrate the serious threats caused by DDT and other pesticides
3. to show the amounts of DDT and other pesticides involved with human hormones
4. to explain the effectiveness of DDT and other pesticides in controlling mosquitoes
55. What is the writer primarily concerned with?
1. Controlling the use of DDT that has not yet been successful for long
2. Encouraging the readers to realize how significant DDT is
3. Giving examples of the hazardous effects of DDT on human health, wildlife, and plants
4. Discussing the persistence and effects of DDT and several other pesticides found all over the globe