体现前运算阶段儿童认知特点的活动是（）。

A.儿童能够找到不在眼前的物体

B.儿童能抓住毯子的一角，通过拉毯子来取得放在毯子另一角的玩具

C.孩子认为比他小的都是弟弟妹妹，他们将来都会变成自己

D.儿童试图打开一只稍开口的火柴盒，失败后，他会缓慢地一张一合小嘴，最后突然顿悟，将手指插进盒子把它打开

—You were injured in the accident, weren't you ?

—           , but look, I'm all right now.      

A．Yes, I was

B．Yes, I wasn't

C．No, I was

D．No, I wasn't