C. Furthermore, they soon take over the natural habitats of Australia’s native species.
D. The task now facing the country is how to remove the toads.
E. But this advantage also has a big drawback — up to 10% of the biggest toads suffer from arthritis.
F. Toads are not built to be road runners — they are built to sit around ponds and wet areas.
参考答案:
46-50 EDCAB