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 his colleagues 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.
____________
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.
【2013年职称英语考试《卫生类A级》考试真题】相关文章:
最新
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02