共用题干 Toads are Arthritic and in PainArthritis（关节炎）is an illness that can cau...

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问题共用题干 Toads are Arthritic and in Pain

Arthritis（关节炎）is an illness that can cause pain and swelling in your bones. Toads（蟾蜍）,a big
problem in the north of Australia,are suffering from painful arthritis in their legs and backbone,a new study
has shown. The toads that jump the fastest are more likely to be larger and to have longer legs._________(46)
The large yellow toads,native to South and Central America,were introduced into the north-eastern Aus-
tralian state of Queensland in 1935 in an attempt to stop beetles and other insects from destroying sugarcane
crops.'Now up to 200 million of the poisonous toads exist in the country,and they are rapidly spreading
through the state of Northern Territory at a rate of up to 60 km a year. The toads can now be found across
more than one million square kilometres._________(47)A Venezuelan poison virus was tried in the 1990s
but had to be abandoned after it was found to also kill native frog species.
The toads have severely affected ecosystems in Australia.Animals,and sometimes pets,that eat the toads
die immediately from their poison,and the toads themselves eat anything they can fit inside their mouth.
_________(48)
A co-author of the new study,Rick Shine,a professor at the University of Sydney,says that little alien-
tion 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 kilometre a night._________(49)
But speed and strength come at a price一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
constant march across the landscape.

选项 _________(50) A:Toads are not built to be road runners一they are built to sit around ponds and wet areas. B:The task now facing the country is how to remove the toads. C:Furthermore,they soon take over the natural habitats of Australia's native species. D:Toads with longer legs move faster and travel longer distances,while the others are being left behind. F:But this advantage also has a big drawback一up to 10%of the biggest toads suffer from arthritis. F:But arthritis didn't slow down toads outside the laboratory,the researchers found.

答案 F

解析文章第一段说，蟾蜍遭受的关节炎病痛主要来自腿部和背部骨头。而本处空格前面一句提到，跳跃速度最快的蟾蜍更可能是个子大、腿长的那些。后一句应是讲这些大个子蟾蜍患关节炎的情况。故选E。
下面提到为了消灭蟾蜍而引进的毒性病毒被发现不可行，因为这些病毒把当地的青蛙也杀死了。可知，这一句应该与除去（remove)蟾蜍有关。故选B。
该段讲述了蟾蜍严重影响了当地的生态平衡，选项C是其中一项。
前面一句讲跳跃速度最快的蟾蜍一晚上可以行进将近1公里，后面一句讲到蟾蜍为它们高速跳跃付出了代价，即患上关节炎。可知，这两句中间的句子应该与蟾蜍跳跃和行进速度有关。故选D。
由前面一句提到researchers（研究者）可知，这一句应该与研究情况有关。故选F。

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共用题干 Toads are Arthritic and in PainArthritis（关节炎）is an illness that can cau...

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