有人指出，让世界经济为美国经济服务，让世界各地的人们为美国人打工，这是美国在20世纪40年代就已经筹划好的如意算盘，而且美国成功地让世界各国纷纷钻进自己设计的“圈套”之中。材料揭示了美国（     ）

12月18日，南昌上空碧空如洗。南昌连续三日空气质量指数（AQI）在50左右，空气优良。加上天气晴暖，市民们纷纷来到室外享受这久违的冬日暖阳。但要留住“南昌蓝”，我们还需要做出更多的努力。人类这么重视“天空的蓝”，是因为（      ）

    Have you ever thought about your life after you grow up? It is not easy --- that's what some US students say after they try out adult (成年人) life at school.

    Mount Logan Middle School, Utah, has an activity called Reality Town. Each student gets a “job” and some money. The higher the grade (成绩), the better the job they can get. Then, they have to pay for different things in the real world, such as transportation (交通) and groceries . Some of them have a “husband (丈夫)” or a “wife” and maybe a few “kids”. Student Jason Peisley, 13, became a father with a 5-year-old girl. The hardest part for him was paying taxes (税).“I make $90,000 (571,000 yuan), but after I pay my taxes, I only have $66,000 left,” he said. “Life isn't easy. There are a lot of things to pay for.” “It's a wake up call for these students,” said Greg Aullman, a teacher at Mount Logan, “to learn how much it costs to live. So, they'll study harder than before and love their parents more. ”