参考答案

正确答案：A
解析：这是该国面临的最迫切的问题之一。urgent迫切的, 如：They've made an urgent request for international aid．他们紧急请求国际援助。serious严重的, 如：Lack of water resources is a serious problem in this region．水资源短缺是这个地区面临的严重问题。depressing令人沮丧的, 如：The news is very depressing．这个消息令人非常沮丧。severe严重的, 如：He's suffering from severe mental disorder．他患有严重的精神病。只有urgent意思上和pressing最接近。