The ability of the Kangaroo
The zoo built a special eight-foot-high enclosure for its newly acquired kangaroo, but the next morning the animal was found hopping around outside. The height of the fence was increased to 15 feet, but the kangaroo got out again. Exasperated, the zoo director had the height increased to 30 feet, but the kangaroo still escaped. A giraffe asked the kangaroo, "How high do you think they'll build the fence？"
"I don't know, " said the kangaroo. "Maybe a thousand feet if they keep leaving the gate unlocked.
（1） enclosure n.围墙
（2） kangaroo n.袋鼠
（3） exasperated adj.恼火的
① What had the zoo newly squired？
② Why did the zoo keep increasing the height of the fence？
③ How did the zoo director feel about it？
④ Why could the animal still escape even when the fence was increased to a height of 30 feet？
⑤ What does the passage imply？
① The zoo had newly acquired a kangaroo.
② Because the kangaroo kept getting out of the fence.
③ The director felt exasperated.
④ Because the door of the fence was not locked.
⑤ The passage implies that the zoo was in bad management.