听下面一段材料,回答 15~17 题。
第 15 题 What were the Wright brothers trying to do in the first place?
A.They wanted to attract public attention.
B.They tried to become skillful at flying.
C.They wanted to test their kites.
第4题
当婴幼儿嘴里含有豆粒、花生米等食物时,保育员()是幼儿气管呛入异物的预防与处理的措施之一。
A.不理会
B.轻拍婴幼儿的背
C.不能训斥他
D.不让吃
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