B．He seemed uncertain about his future.

　　C．He regretted being in the HouseMates.

　　D．He was rather lost after being well-known.

　　B

　　Black-footed ferrets cannot live without prairie dogs. These ferrets live, hunt, and raise their young only in large prairie dog towns?vast networks of tunnels on prairies in parts of the western United States.

　　For a hundred years, farmers have shot and poisoned prairie dogs, believing that they compete with their cows and sheep for grass. Farmers are also concerned that prairie dog burrows（洞）cause cattle and horses to trap and break their legs. Most large prairie dog towns were wiped out. Ferrets disappeared, too. Scientists say that to support a ferret population a town must cover hundreds of acres.

　　By the 1990s disease swept through the colony（领地）, killing ferrets and prairie dogs alike. Black-footed ferrets were assumed to be dying out. But in 2001 a black-footed ferret was discovered on a remote farm in Wyoming. Excited by the find, scientists from university, state and federal wildlife organizations searched the surrounding area. During the next four years they found more than a hundred ferrets!

　　Pampered and well fed in their new home, the surviving ferrets reproduced. Within seven years there were 400 black-footed ferrets in a controlled environment. It was time to try reintroducing them to the wild.

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