单项选择题 In today's world markets, poor developing countries tend to rely primarily on exports of ___________.

多项选择题 相对于专项分析，综合分析具有的特征包括（）A、比较基准和角度存在差异B、分析问题的方法不同C、分析的使用者不同D、综合分析更具概括性和抽象性E、主副指标的相互关系不同

多项选择题 An employee is usually dismissed from a job as a result of __________. A. unsatisfactory work performance B.  poor behavior or attitude that does not fit with the corporation’s culture C.  unethical conduct that violates the company’s policies

问答题 张紧轮与主动轮、从动轮在结构，功能方面有哪些区别？

单项选择题 when you're writing to someone who went out of their way for you ,people really appreciate （ ） letters.