题目选项分析

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.

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