题目

Lying in the sun on a rock, the cougar(美洲豹)saw Jeb and his son, Tom before they saw it. Jeb put his bag down quickly and pulled his jacket open with both hands, making himself look big to the cougar, It worked.  The cougar hesitated, ready to attack Jeb, but ready to forget the whole thing, too. Jeb let go of his kacked, grasped Tom and held him across his body, making a cross.  Now the cougar’s enemy looked even bigger, and it rose up, ready to move away, but unfortunately Tom got scared and struggled free of Jeb. “Tom, no” shouted his father. But Tom broke and ran and that’s 小华拿一个矩形木框在阳光下玩，矩形木框在地面上形成的投影不可能的是（ ）A．B．C．D．