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DELETE语句只是删除表中的数据，表本身依然存在数据库中。()

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听力原文：Man is a child first, after which he attains his youth. After youth he goes through the second phase of childhood, also called as old age. This is the phase where everyone needs a comfort of a sense of belonging and being taken care of. Wouldn't we all expect the same of security when we grow old？ Even our parents are expecting us to be their caretaker, as they grow old. But they never make that obvious to us.
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Why does the author say that the European society, at least in Nordic countries, is "far less stable than America's"？ (Para.3)

变量y对x的回归直线方程为y=kx，可以用这个方程大致表示两个变量间的关系。()

在用相关系数检定法来检定相关关系时，通常先计算相关系数，后选定危险率。()