Passage 2

Which of the following statements is true about the recent study released in the American Journal of Preventive Medicine a. It is the first in its kind. b. It is a huge project carried out by a single person. c. Its major purpose is to identify the most important preventive measures. d. It made an investigation into the governmental investment in medical services.

论述岛屿生态在自然保护区规划上的指导意义？