东北地区位于中国____部，地形以____、丘陵和____为主，东北地区属____气候，冬季寒冷漫长，夏季温暖短暂。

运用《经济生活》知识判断，下列说法中合理的是（  ）

①大饥荒时期，土豆价格飙升，但土豆需求量却仍有可能持续加大

②经济高速增长期，必须维持宽松货币政策，不断增加货币发行量

③春节假期来临前，大量加价倒卖紧俏车票，符合等价交换的原则

④经济快速下滑期，企业通过社会集资等形式，可适当缓解融资难

   Today more and more cars go into families. Which car is the best for people? Different people have different ideas.
   Some people like the bright colour car made in China. It's really a good choice(选择). The bright colour car made in China is cheap, nice and safe. This kind of cars is suit for(适合于) the general income (收入一般的) family.
   Some people love famous foreign cars like Japanese cars, American cars and German cars. They're good but too expensive. But most people think famous foreign cars of better quality are better in safety. These are suit for the high income family or for business.
Some people like sports cars, because they're fast and exciting. Some sports cars are very nice but very expensive. Only rich people can afford them.
   Some people like travelling, so they need a travel car. Travel cars are comfortable. But they use much oil(油). What's the best car for us? Maybe it's a new and popular topic in life.