The structure of a family takes different forms around the world and even in the same society. The family's form changes as it adapts to 41 (change) social and economic influences. Until recently ,the most common form in North America was the nuclear family, 42 (consist) of a married couple with their minor children, The nuclear family is an 43 ( depend) unit. It must be prepared to fend for it self. Individual family members 45 (strong) depend on one. another. There is little help from outside the family in emergencies. Elderly 45 ( relative) of a nuclear family are cared for only if. it is possible For the family to do s0. In North America,the 46 ( elder) often do not live with the family;they live in 47 ( retire) communities and nursing homes.
There are many parallels. between the nuclear family in, 48 ( industry) societies, such as North America,and of family in societies such as that of the Inuits, who live in harsh environments. The nuclear family structures well 49 ( adapt) to a life of mobility. In harsh conditions, mobility allows the family to hunt for food. For North Americans,the hunt for jobs and 50 ( improve) social status also requires mobility.
21. It was once believed ,and thus we can tell how successful he/ she will be in the future according to his/her intelligence.22. More recent researches has shown that intelligence is only partlyinherited.23. We. can observe and measure observed intelligence, but genetic intelligence.24. It can be inferred from the passage that a child willif hehas more opportunities to communicate with others by means oflanguage.25. Children were not just,but they can be taught to bemore intelligent at school. A. born to be more intelligent or less intelligentB. have 8 better chance to develop, his intelligenceC. can't be observed and measuredD. that intelligence was something a baby was born withE. and because of the lack of communication with his classmatesF. and partly has to do with a child's living environment