F.Furthermore, they soon take over the natural habitats of Australias native species.
47、 ____________
A.But this advantage also has a big drawback -- up to 10% of the biggest toads suffer from arthritis.
B.The task now facing the country is how to remove the toads.
C.But arthritis didnt slow down toads outside the laboratory.
D.Toads with longer legs move faster and travel longer distances while the others are being left behind.
E.Toads are not built to be road runners -- they are built to sit around ponds and wet areas.
F.Furthermore, they soon take over the natural habitats of Australias native species.
48、 ____________
A.But this advantage also has a big drawback -- up to 10% of the biggest toads suffer from arthritis.
B.The task now facing the country is how to remove the toads.
C.But arthritis didnt slow down toads outside the laboratory.
D.Toads with longer legs move faster and travel longer distances while the others are being left behind.
E.Toads are not built to be road runners -- they are built to sit around ponds and wet areas.
F.Furthermore, they soon take over the natural habitats of Australias native species.
49、 ____________
A.But this advantage also has a big drawback -- up to 10% of the biggest toads suffer from arthritis.
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