VI. Reading Comprehension: for each        The African elephant poaching crisis is not only bad for elephants but also harmful for tourism, according to a new study by researchers from the University of Vermont, the World Wildlife Fund and the University of Cambridge.       “While there have always been strong moral and ethical reasons for conserving elephants, not everyone shares this viewpoint. Our research now shows that investing in elephant conservation is actually smart economic policy for many African countries,” said Dr. Robin Naidoo, lead wildlife scientist at WWF and lead author on the study.       Anywhere from 20,000 to 30,000 African elephants are killed each year to feed the illegal ivory trade, fueled hugely by demand in China. Elephant populations in the region have declined by more than 20 percent during the past 10 years.       “We know that within parks, tourism suffers when elephant poaching    ramps up   . This work shows convincingly that stronger conservation efforts usually make economic sense,” said study co-author Professor Andrew Balmford, from the University of Cambridge’s Department of Zoology.       “The average rate of return on elephant conservation compares favorably with rates of return on investments in areas like education,” said Dr. Brendan Fisher, an economist at University of Vermont’s Gund Institute for Ecological Economics. “For example, for every dollar invested in protecting elephants in East Africa, you get about $1.78 back. That’s big deal.” (adatped from “Elephant Poaching Hurting African Tourism” at http://www.voanews.com)
【題組】46. What is the main idea of this passage?
(A) WWF works with the University of Cambridge to conserve the African elephant population.
(B) Illegal elephant hunting has a negative effect on nature-based tourism economies in Africa.
(C) Investments on education does not make as many profits as those on conservation in Africa.
(D) A never-ending demand from China generates the unnecessary killing of African elephants.