There were many difficulties to overcome when trying to return human-raised animals to the wild. Used to being fed and protected, the animals must quickly learn to find their own food and avoid danger. Another problem was that humans and ferrets share the same land. Local farmers were concerned about the restrictions （限制） that might be placed on grassland. Protecting reintroduced black-footed ferrets from disturbances might restrict the farmers’ fencing and grass areas. Wildlife agency officials worked with the farmers to find acceptable agreement.

　　In 2006 the first black-footed ferrets were freed into prairie dog towns in Wyoming. The next summer there were four new wild-born ferret litters on the prairie. But most of the reintroduced ferrets died. Looking for ways to help more ferrets survive after release, scientists started a preconditioning program. Inside dirt pens young ferrets learned to run through prairie dog tunnels in a real burrow and fight and kill live prey. Researchers hope the program will give black-footed ferrets a fighting chance.

　　60．Black-footed ferrets and prairie dogs are ALIKE, for they both ____

　　_.

　　A．live in shared burrows

　　B．survive from the disease

　　C．eat grass as their main diet

　　D．have similar markings on their coats

　　61．According to the passage, what made black-footed ferrets almost die out?

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