46（）

A. Toads with longer legs move faster and travel longer distances, while the others are being left behind.
B. But arthritis didn’t slow down toads outside the laboratory, the researchers found.
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.