题目

阅读下面短文，从短文后各题所给四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。 The survey about childhood in the Third World shows that the struggle for survival is long and hard . But in the rich world , children can 1 from a different kind of poverty—of the spirit . 2 , one Western country alone now sees 14,000 attempted suicides（自杀）every year by children under 15 , and one child 3 five needs psychiatric（心理）advice . There are many good things about 4 in the Third World . Take the close and constant relation between children a在一定条件下，RO3n-和氟气可发生如下反应：RO3n-+F2+2OH-═RO4-+2F-+H2O，已知R为短周期元素，则可知在RO3n-中，元素R的化合价是+5+5；元素R在周期表中的位置是三周期、VIIA三周期、VIIA；列举由元素R形成单质的两种用途：制备漂白粉制备漂白粉，制备盐酸制备盐酸．