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.
F.Furthermore, they soon take over the natural habitats of Australias native species.
50、 ____________
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.
F.Furthermore, they soon take over the natural habitats of Australias native species.
第6部分:完形填空(第52~65题,每题1分,共15分) 下面的短文有15处空白,请根据短文内容为每处空白确定1个最佳选项。
51、根据下列材料,回答51-65题
Scientists Develop Ways of Detecting Heart Attack
German researchers have come up with a new generation of defibrillators and early-warningsoftware aimed at offering heart patients greater (51) from sudden death from cardiac arrest.
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