题目

阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项。 Anna lived on the side of a valley. One summer, there was a very big 36 , and a lot of houses down below Anna’s were washed away. Anna’s house was 37 enough to escape the flood, so when the water had 38 and the other houses were  39  there with no roof and no walls and all covered with mud(泥), her house was just all right.   Her house was quite small, her husband was dead, and she had four children, 40 Anna took in one of the families that had lost 41 in th下列说法中，正确的是（    ） A．在四种元素中，最高正化合价数值最大的是P B．在N、F、Mg、Cl四种元素中，原子半径最小的是 C．原子序数从3—10的元素，随着核电荷数的递增，原子的最外层电子数递增 D．（硅烷）比稳定