题目内容
河北省河流众多，长度在18公里以上1000公里以下者就达300多条。境内河流大都发源或流经燕山、冀北山地和太行山山区，其下游有的合流人海，有的单独人海，还有因地形流入湖泊不外流者。主要河流从南到北依次有漳卫南运河、子牙河、大清河、永定河、潮白河、蓟运河、滦河等，分属海河、滦河、内陆河、辽河4个水系。其中海河水系最大，滦河水系次之。这段材料重点介绍了（）。
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所有出口食品报检时需提《进出口食品标签审核证书》或《标签审核受理证明》。
Dr. Vink's results must be interpreted with care because
听力原文：M: Hi, Christie, I brought you some tea.
W: Thanks, Mark. Too bad it's not apple tea, like in Turkey.
M: You really liked living in Turkey, didn't you？
W: Yeah, it was great.
M: How do you like the food in Turkey, Christie？
W: Oh, the food was fantastic! But people always expected me to eat too much, and I gained a lot of weight there!
M: Yes, it's so polite to be generous. We think people aren't polite if they don't offer a lot of food.
W: I know. I also learnt that it's not polite for the guest to accept the offer of food at first.
M: Yes, that's definitely true! If you're the guest, you must refuse the first two offers of food.
W: The first time I had dinner at a Turkish home, I felt rude to refuse. So I ate all the food the host offered me.
M: Do you know how to stop the host from offering you food？ You must leave some food on your plate. Then the host knows that you're full.
W: Oh, is that the trick？ In the United States, we usually eat everything. You don't want the host to think that you don't like the food.
M: That is the difference.
W: Americans think it's not polite to insist. We don't want to force you to eat more if you don't want more.
Where are these two speakers from respectively？
卫生检疫机关对已在到达本口岸前的其他口岸实施卫生处理的交通工具一律不再重复实施卫生处理。
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