小题1:B
小题2:C
小题3:A
小题4:D
本文讲述了在克罗地亚熊学会了敲门进入人类房子的故事。
小题1:细节题。文章第三段可知专家认为熊是偶然学会的。
小题2:猜测词义题。I ran for it as he walked in as if it was the most normal- thing in the world.”it用来指代前面提到的he walked in.
小题3:推理题。根据文章倒数第二段Bears are a common thing in the woods around here, but no one has ever heard of a bear that knocks at the door.可知熊敲门是不同寻常的。
小题4:推断题。根据文章最后一段可知,为了防止熊进入房子,他们采取了很多方法,但是都不奏效。说明熊很聪明。