Everyone in the tourist industry has made the point that __________ Government assistance is helpful, what they actually need most is for the visitors themselves to return.
A：as
B：when
C：while
D：since
点(-2．1)所在的象限是 ( )
阅读下列材料，回答问题。
材料一：雄赳赳，气昂昂，跨过鸭绿江……节录《中国人民志愿军军歌》
材料二：我是美国历史上第一个在没有取得胜利的停战协定上签字的司令官。——“联合国军”总司令克拉克的回忆录。
请回答：
