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在一个拥有1500名本科生的文学院进行一次学生对公共心理学课的态度的研究，一种方法是设计一项纵向研究，从新生班级开始，每年一次调查这一总体中的随机选择样本。另一种方法是运用横向设计，从4个本科班级总体中随机选择样本，同时对它进行调查。如果采用焦点团体访谈法，请设计一个访谈提纲。
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Where can the man get money
第三节 短文理解 2 阅读下面短文，从短文后所给问题的A、B、C三个选项中选出一个正确答案。 Young people like to form groups. If you are not up to their standard, you will not be accepted into their group. And if you are an inner- going person and you are very shy, you may not dare to talk to others. Then what should you do You should take the first step. Don’t wait until others come to talk to you. You should go to them and say "Hello" first. Then you will start a conversation. If you share some interests, you will become very close friends. You should also keep an eye of personal interest of others. Being interested in others will show that you care about them. A boy named David, for example, is very successful in making friends. He says, "I have a real love for people and I take an active interest in others." He adds, "One of the biggest things is to know that person’s name. Others are impressed that you care enough to remember their names. Because of this they may share some experience or problem with you. And the friendship starts to build." True, taking an interest in others is the key to starting friendship. When you want to make friends with someone, you should not pretend to be someone else. If you pretend to be better than you really are, you will lose him or her when they find out. Young people like to ______.
案情：大兴公司与全宇公司签订委托合同，由大兴公司委托全宇公司采购500台彩电，并预先支付购买彩电的费用50万元。全宇公司经考察发现甲市W区的天鹅公司有一批质优价廉的名牌彩电，遂以自己的名义与天鹅公司签订了一份彩电购买合同，双方约定：全宇公司从天鹅公司购进500台彩电，总价款130万元，全宇公司先行支付30万元定金；天鹅公司采取送货方式，将全部彩电运至乙市S区，货到验收后一周内全宇公司付清全部款项。天鹅公司在发货时，工作人员误发成505台。在运输途中，由于被一车追尾，20台彩电遭到不同程度的损坏。全宇公司在S区合同约定地点接收了505台彩电，当即对发生损坏的20台彩电提出了质量异议，并将全部彩电交付大兴公司。由于彩电滞销，大兴公司一直拒付货款，致全宇公司一直无法向天鹅公司支付货款。交货2个星期后，全宇公司向天鹅公司披露了是受大兴公司委托代为购买彩电的情况。问题： 天鹅公司事先并不知晓全宇公司系受大兴公司委托购买彩电，知悉这一情况后，天鹅公司能否要求大兴公司支付货款？为什么？
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