試題詳解

48. What is the main idea of this passage?
(A) Researchers have found an effective way to halt the spread of insect-borne diseases around the world.
(B) Many people are worried about the effects of genetically modified organisms on the environment.
(C) It takes time to gain public support for the application of genetic modification to disease control.
(D) Genetic engineering looks promising in reducing malaria, though there may be unknown consequences.