单选题：第50题_________

题目分类：卫生类
题目类型：单选题
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题目内容：

第50题_________ 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 didn't 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 Australia's native species.

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