题目选项分析

The giant ground sloth Megatherium americanum, having stood twelve feet tall, weighing nine thousand pounds, and wielding seven-inch claws, itmay have been the largest hunting mammal ever to walk the Earth.

Standing twelve feet tall, weighing nine thousand pounds, and wielding seven-inch claws, Megatherium americanum, a giant ground sloth,may have been the largest hunting mammal ever to walk the Earth.