好像是关于冠词的练习,求大家帮忙把每个空要填什么,和为什么要填这个都解释一遍,

题目

好像是关于冠词的练习,求大家帮忙把每个空要填什么,和为什么要填这个都解释一遍,
_____________ news of ___________ North Korea's nuclear test came as __________ shock to me. 
 ________ material used for running tracks in schools across China may be _________ danger to children's health.

答案

____A_________ news of _____the______ North Korea's nuclear test came as _____a_____ shock to me.第一个A：一则新闻,量词第二个the：特指关于朝鲜核试验的（这个）新闻第三个a:对我来说是一次震惊__The______ ...