题目

曲线y＝－在点处的切线的斜率为( ) A．－                     B. C．－                    D. 答案：BIt is the first school that teaches us right and wrong. It is our dearest place that protects us from danger. It is our f 【1】 .This year marks the 20th anniversary of International Year of the Family， which offers us a window to look into families in the E 【2】 and West.Usually， we think families are just parents and children. But the structure are different in different cultures.In many A 【3】 countries， extended families (大家庭) are common. In some big cities， families usually have three generations (一代人) living in the same house. When parents are busy with work， grandparents help to do housework and take care of the children.While in most W 【4】 countries， many people prefer nuclear families (核心家庭)： families that have only parents and children. During the daytime， working parents send their children to their grandparents’ home or a daycare center. And after work， they pick the children back up and go home. Some families are even DINK (double income， no kids). According to a 2010 Pew Research report， one in five American c 【5】 don’t want a child.In addition to structure， responsibility(责任)of parents to their children can also be d 【6】 .In China， many parents look after their children all the way into adulthood. It’s normal for parents to p 【7】 children’s college tuition (学费). After graduation， many parents also help find a job for their children， or buy an apartment for them.In Western countries， however， children are supposed to be independent (独立的)after they r 【8】 the age of 18. Most parents will not pay their children’s tuition. Young people mostly have a part-time job or turn to the g 【9】 for help to cover their tuition. After graduation， if they can find a job， parents usually won’t cover most of their cost of living any m 【10】 .Although families in the East and West may differ， it is the best place to warm us and teach us important values of love and care.