为了判定两个分类变量X和Y是否有关系，应用K²独立性检验法算得K²的观测值为5，又已知P（K²≥3.841）=0.05，P（K²≥6.635）=0.01，则下列说法正确的是（　　）

根据句意和汉语提示，写出单词的正确形式。
____ On Children's Day, children could not hide their______________(excite).
____ He comes from the _______________(south) city of China.
____ Jim is happy to live on the ____________ (twelve) floor because he enjoys the view out of the windows.
____ Mr. and Mrs. Wang will celebrate their fifteen years of ____________ (marry) this weekend．
____ The water in the river is______________(harm). You can drink it without cooking.

16－6____6

△ABC中，已知BD和CE分别是两边上的中线，并且BD⊥CE，BD=4，CE=6，那么ABC的面积等于（    ）