A co-author of the new study, Rick Shine, a professor at the University of Sydney, says that little attention has been given to the problems that toads face. Rick and hiscolleagues studied nearly 500 toads from Queensland and the Northern Territory and found that those in the latter state were very different. They were active, sprinting down roads and breeding quickly.

According to the results of the study, the fastest toads travel nearly one kilometer a night. ____ (49) ____But speed and strength come at a price -- arthritis of the legs and backbone due to constant pressure placed on them.

In laboratory tests, the researchers found that after about 15 minutes of hopping, arthritic toads would travel less distance with each hop (跳跃). ____ (50) ____These toads are so programmed to move, apparently, that even when in pain the toads travelled as fast and as far as the healthy ones, continuing their relentless march across the landscape.

请在第__(46)__处填上正确答案。

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.

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