题目内容：
回答(50)题 A．Butthisadvantagealsohasabigdrawback--upto10%ofthebiggesttoadssufferfromarthritis.
B．Thetasknowfacingthecountryishowtoremovethetoads.
C．Butarthritisdidn'tslowdowntoadsoutsidethelaboratory.
D．Toadswithlongerlegsmovefasterandtravellongerdistanceswhiletheothersarebeingleftbehind.
E．Toadsarenotbuilttoberoadrunners--theyarebuilttositaroundpondsandwetareas.
F．Furthermore,theysoontakeoverthenaturalhabitatsofAustralia'snativespecies.
参考答案：
答案解析：